A GOODSTUDENT
Popular questions and responses by A GOODSTUDENT
MATHS 2
If x+y=45°, prove that {(cotx+1)(coty+1)}/{cotx×coty}=2 Please help me in this TRIGONOMETRY problem. From the topic  TRIGONOMETRY Ratios of compound angles
asked on October 26, 2016 
Mathematics
A dealer gains a selling price of 4 watches by selling 20 watches. What is the percentage of profit?
asked on May 23, 2017 
Physics
One ship, sailing east with a speed of 7.5 m/s, passes a certain point at 8A.Mand a second ship sailing north at the same speed, passed the same point at 9:30 A.M. At What time are they closest together and what is the distance between them then?
asked on October 17, 2017 
Physics
In a Young's Double Slit experiment, the separation of four bright fringes is 2.5mm, the wavelength of light used is 6.2*10^7m. If the distance from the slits to the screen is 80cm, calculate the separation of two slits. I tried applying
asked on May 2, 2019 
MATHS
A dishonest shopkeeper has 2 false balances. One balance weighs 10 %more while buying goods and other weighs 10% less while selling the goods. Find his gain percent just by weighing. Plzz help How do I start and how to solve it
asked on August 20, 2016 
math (opt) math 2
A flagstaff of placed at one corner of a rectangular playground 40m long and 30m wide. If the angle of elevation of the top of flag staff from the opposite corner of 30°, find height of the flagstaff. (The question is complete and I have cross checked the
asked on September 10, 2016 
Physics
In a Young's Double Slit experiment, the separation of four bright fringes is 2.5mm, the wavelength of light used is 6.2*10^7m. If the distance from the slits to the screen is 80cm, calculate the separation of two slits. I applied 4*¥D/d=1.5*10^3m but
asked on May 3, 2019 
Math
The product of numbers 3^(1/3).3^(1/9).3^(1/27)...... To infinity is A.3 B.3^(1/3) C.3^(1/2) D.3√3
asked on May 21, 2017 
Science
A ball is dropped from a height of 20 meter and rebounded with a velocity which is 3/4 of the velocity with which it hits the ground. What is time interval between the first and second bounces?
asked on May 15, 2017 
Physics
Two trains are running on parallel tracks., train A is faster than B.There is a box on each train of identical nature. But mass of box in train A is more than that of train B. If box is changed between the trains, what happens to speed of trains? A.Same B.
asked on April 24, 2017 
Physics
If a stone is thrown with velocity 10 m/s. How high will it reach after 10 s. Take g = 10 m/s^2 I want to know if this question is practically possible. I tried to solve this problem and ended up getting the answer in negative. Please help me!!! Afterall
asked on April 22, 2017 
Science  heat
1By opening the door of a refrigerator ehich is inside a room, the temperature of the room : A) decreases B) increases C) remains unchanged D) first decreases and then increases******(my ans) 2 The thermometer used to measure very low temperature is 
asked on April 21, 2017 
math
please help me with this question. I just can't figure it out. A cylindrical jar of radius 6cm contains water. How many iron solid spheres each of radius 1.5cm are required to immerse into the jar to raise the level of water by 2cm?
asked on November 9, 2016 
Math2
IF (1/SinA)+(1/cosA)= (1/sinB)+(1/cosB) Prove that cot((A+B)/2)=tanA tanB Please helppppppppppp
asked on October 26, 2016 
Math
Ben buys some oranges at the rate of 10 per $. He also buys equal number of oranges at the rate of 12 per $. He mixes them together and sells them at 15 per $. Find his loss or profit percent.
asked on September 16, 2016 
math2
Find the equation of the straight line passing through the point(3,2) and making an angle of 60° with the line√3x+y1=0 Plzz help someone
asked on September 14, 2016 
math2
I was solving a problem. In It r have been given that two lines are perpendicular to each other The equation of one line 2x3y+4=0 Now i have to find the equation of another line We can find it by finding the slope of the abovementioned line( the other
asked on September 14, 2016 
MATHS2
Solve (0
asked on September 13, 2016 
English
This was a question asked in our last test Either of her eyes  not work well. (Do, does, is) I answered 'do' but some of my friends say 'does' is the correct answer. Now I am really confused. Please someone help. What's the correct answer???
asked on September 10, 2016 
social exam tomorrow
Who are gaochos?
asked on September 8, 2016 
math
2 boys and 5 girls can finish a piece of work in 4 days. 4 boys and 4 girls can finish the same work in 3 days. If a girl is paid rs 750 each day, what may be the expenditure to complete the work? Tomorrow is my test and I don't know how to solve this
asked on September 1, 2016 
Math HELP
2 boys and 5 girls can finish a piece of work in 4 days. 4 boys and 4 girls can finish the same work in 3 days. If a girl paid rs 750 each day, what may be the expenditure to complete the work? Tomorrow is my test and I don't know how to solve this
asked on September 1, 2016 
math
The total price of a mobile and a watch is rs8000. If 10% discount and 10% VAT IS imposed on both, their selling price becomes rs7920, find the marked price of mobile and watch separately. Well I did this question and every time I get to a point where the
asked on August 31, 2016 
math
A and B play card on stake. A gains from B 1/4 of the latter's money. B gains from A 1/3 of A's original money. Each has now rs 400. How much money did each have before playing the game? Well I tried this question a lot and have no clue how to do it I made
asked on August 31, 2016 
MATH
The tip of a plant was 6cm above a lake but a sudden wind forced the plant to move 10 cm fat from its original position and then it submerged into the lake. Find the depth of the lake upto which it was sinking. Please help!!!!!!!!!!
asked on August 29, 2016 
radical equation please help!!!
sqrt(1+x) sqrt(1x) = sqrt (1xsqrt(1+x)) Please help This question is..... . . √(1+x)  √(1x) = whole root under OR √1x√(1+x) Please help me
asked on August 29, 2016 
Math or Maths???
Which word is correct to use? Math or Maths?
asked on August 28, 2016 
maths reiny help!!
You had helped me with a similar question. This one says : A whole seller supplies 90 books while he was ordered to send 80 books by a retailer. If 15%trade discount was given, what was the net discount to the retailer? I solved this one in the similar way
asked on August 26, 2016 
MATHS REINY
You had helped me with a similar question. This one says : A whole seller supplies 90 books while he was ordered to send 80 books by a retailer. If 15%trade discount was given, what was the net discount to the retailer? I solved this one in the similar way
asked on August 26, 2016 
MATHS
A manufacturer offers a20% rebate on the marked price of a product. The retailer offers another 30%rebate on the reduced price. Find the single equivalent reduction of the two reductions. Please help!
asked on August 25, 2016 
SCIENCE
When a student added Zinc granules to dilute HCI, a colorless and odorless gas was evolved, which was tested with a burning match stick, it was observed that: (a) The match stick continued to burn brilliantly. (b) The match stick burnt slowly with a blue
asked on August 24, 2016 
MATHS
Rama and Radha each had a set of marbles . rama said to radha 'if you give me 10 of your marbles then i shall have twice as many as you have' . radha said to rama ' if you give me 10 of your, i shall have thrice as many as you have' found the marbles that
asked on August 23, 2016 
maths
A shopkeeper mixes two types of milk costing rs 25per litre and rs 30per litre. if he sells 60litres of mixture for rs 1600, find the quantity of each type of milk.
asked on August 22, 2016 
Maths
Out of group of goats,Two times the square root of the number of goats were kept in shade, 1/4 of the number were taken for grazing and 15 were sold, find the initial no. Of goats?
asked on August 22, 2016 
MATHS (EQUATIONS)
A piece of stone loses its 1/5 th of weight when it is weighted in water and a piece of iron loses 1/10th of its weight under the same condition. The total weight of the both materials in air is 280grams and in water is 240 grams. Find the weight of both
asked on August 22, 2016 
MATHS plzz help ASAP
while paying a bill a man paid $189.80 as the amount of VAT at 13%. how much was the actual bill amount? Plzz help Should i calculate SP+VAT OR ONLY SP
asked on August 22, 2016 
PHYSICS ASAP REPLY
What is the difference between a hydrogen filled balloon and an air filled balloon moving in air? please answer. THe question is from the chapter PRESSURE.
asked on August 20, 2016 
CHEMISTRY
Why is glass considered as a supercooled liquid? answer please!!!
asked on August 20, 2016 
PHYSICS pressure
What is the difference between a hydrogen filled balloon and an air filled balloon moving in air?
asked on August 20, 2016

Math
I am titally lost in this question and have absolutely no idea. Is there some rule or particular formula of solving such questions?
posted on May 21, 2017 
algebra
l=2w1 2{(l+4)+(w1)}=1982
posted on April 23, 2017 
Science  heat
Thank you very much DrBob222
posted on April 21, 2017 
MATH PLEASE HELP!!!
5(2a+5) is the one for 3
posted on October 31, 2016 
chemistry
True solution 1. Sucrose dissolved in water 2. Salt solution 3. Lemon juice 4. Urea in water 5. Acetic acid in water 6. Copper sulphate in water 7. All ionic compounds in water 8. Ethanol in water 9. Glucose dissolved in water 10. Air Could've googled
posted on October 8, 2016 
Math
Am pretty sure that his auto correct is to blame for this.😞😃😞
posted on October 1, 2016 
algebra
While checking it should've been 0.75(80024)+400=182
posted on October 1, 2016 
Grammar
Is it paining? And ur choice is...? How about using brackets and commas for the options?????
posted on September 30, 2016 
math
19 Hmmmmm very similar to what I did when I was here first time
posted on September 29, 2016 
computer science
I will write a simple qbasic program (u make algorithm yourself) CLS for I =2to 20 step 2 Print I Next I End
posted on September 22, 2016 
algebra
'the' not 'he'
posted on September 22, 2016 
Algebra 1
'Rather strange people' lol
posted on September 21, 2016 
Math
Ahh !😊 Now I get it. Thanks
posted on September 16, 2016 
Math pre algebra please help
How about using some parentheses in posting questions
posted on September 14, 2016 
math2
Ahh interchange of coefficients of x and y and sign change of y Now I get it
posted on September 14, 2016 
Maths
Exterior angle of a triangle of the sum of two opposite interior angles. So I see a typo in your question The way to do this is Exterior angle= two opposite interior angle s Or exterior = x+ another interior Find x And then X+ another interior+ y= 180
posted on September 13, 2016 
MATHS2
Thanks
posted on September 13, 2016 
Math
You took 10 as LCM for the first two terms but the second term is negative In your second step you have taken a positive sign Second step must be (31)/10
posted on September 12, 2016 
algebra
Assuming that you meant z=x+(y/2) Or zx =y/2 Or 2(zx)=y Otherwise it you meant z=(x+y)/2 Or x+y= 2z Or y= 2zx
posted on September 12, 2016 
Math
I don't see any way to solve this one. And you have 3 boxes and all options are odd numbers and you have an even number on the RHS PROBABLY THERE IS SOME TECHNIQUE Or you need to some smartness here 3 factorial gives 6 so 1 solution that I see here is
posted on September 11, 2016 
Math
3  wrong 4wrong again You need some practice with this 20/10 For your ease Eliminate the negative signs coz  divided by is plus Now cut the two zeros The you have 2/1 And answer is 2 Try 4 yourself
posted on September 11, 2016 
Math
1. 87396 gives a negative value. 2. Yes 3. No negative value divided by another negative value gives a positive value 4. Both your selections are wrong You can type the problems on Google or on a calculator to check them.
posted on September 10, 2016 
English
Oh did I type I answered do? I am sure I answered does and my friend s said do That was a brain fade. Typo
posted on September 10, 2016 
English
Thank you so much. Now I got some relief.
posted on September 10, 2016 
math (opt) math 2
Oh so u used Pythagoras theorem for the diagonal. Thank you
posted on September 10, 2016 
Math
From 1 Xy=5 Or x= 5+y Putting value of x(ie  5+ y) in eqn. 2 5+2y =7 Or y=(75)/2 Solve for y and put the value of y in equation 1
posted on September 9, 2016 
maths
I know I can't help you but Is this the nikhiljain riddle ( like the 'Einstein's riddle') And who gives such large questions. And what about grammar and punctuation. And I don't see a question there. It seems as if it's a paragraph and there is no
posted on September 9, 2016 
social exam tomorrow
According to my text  gaucho's are the cowboys of Argentina who look after the cattle in the pampas AM I RIGHT???
posted on September 8, 2016 
maths
Google says 145.2
posted on September 8, 2016 
math age problem
Let your age(not mine) be x 4(x6)x=10
posted on September 5, 2016 
math
Suppose I am 20 yrs old Then 25*2=5010=40/2=20 My age again. Don't look the solution I have broken maths there with those equal to signs
posted on September 5, 2016 
Physics
Look subject
posted on September 4, 2016 
math
Well I have no idea how I got 4 there. I meant 3
posted on September 3, 2016 
math
Let numerator be x and denominator be y Fraction is x/y 1st case x+1/y+1 = 3/4 2nd case. X3/y4= 1/2 Solve for x and y
posted on September 3, 2016 
Algebra
I think reiny already answered the same question. Look at related questions below
posted on September 2, 2016 
math
Thanks allot. that helped a lot . I hadn't even understood latter half of the question so this helped a lot
posted on September 1, 2016 
Math
Correct
posted on September 1, 2016 
Math HELP
I meant 'if a girl is paid rs 750......'
posted on September 1, 2016 
math
Thanks a lot
posted on August 31, 2016 
math
Na! I checked out twice. Nothing extra is given. So it is perhaps one of those types!
posted on August 31, 2016 
maths need helper
How about cos inverse(200) Is this correct
posted on August 30, 2016 
radical equation please help!!!
But how did you get +√1.5 it's√1.5 But still according to you the question is incomplete. However if x=0 then you would get a true equation. But how do I solve it to get even at least 0
posted on August 29, 2016 
algebra
Length = 2* width Let length be l and w be the width Then 2(l+w)=126 2(3w)=126 W=126/6 Find out what you want to find. And please type the full question. That one seems to be just a statement.
posted on August 28, 2016 
math
Digits be x and y and number is 10x+y xy=24 (assuming you meant the product of the digits) And second equation is 10y+x(10x+y) = 27 Take over
posted on August 28, 2016 
science
Look related questions below and it is better that you Google such questions
posted on August 26, 2016 
Statistics
I am a part of history
posted on August 26, 2016 
maths reiny help!!
I reckon the book has a misprint answer because, my friends said that they had the same concept and had done the solution the same way. Thanks for the help any way reiny. And anyway I am from Nepal not USA.
posted on August 26, 2016 
math
3cos@=1 Cos@ = 1/3 Sec@ = 1/(1/3) Sec@ = 3
posted on August 26, 2016 
Science
Collect more sunlight
posted on August 26, 2016 
MATHS REINY
?????
posted on August 26, 2016 
algebra
Area = l*w So let width be w and length be w+6 Noe equation is B(B+6) = 72 Solve for B and find the answer
posted on August 26, 2016 
science
SiO2 But better put such types of questions in Google than waiting around here.
posted on August 26, 2016 
Math
Do you mean  (Y^12)/(Y^12)
posted on August 26, 2016 
math (7th) grade
Put that in calculator 2.65.4
posted on August 26, 2016 
algebra
m=d*v. Lol
posted on August 26, 2016 
MATHS
Thanks reiny. I got it. and I also got how u got it
posted on August 25, 2016 
SCIENCE
Thanks
posted on August 24, 2016 
Math
Ooopsie made a little typo. It's y+y+ 28= 50 But if the question demanded an equation as I mistakenly posted then you may have to convert the value into years and months
posted on August 24, 2016 
Math
Let gir's age be y and father's be y+28 Now equation is y+y+5=50 And solve
posted on August 24, 2016 
Maths
Thanks
posted on August 22, 2016 
Maths Algebra
let mona's curent age be y and father's be x 1st case 3y=x 2nd casex+12=2(y+12) or x+12=2y+24 since x = 3y 3y+12=2y+24 and y = 12 x = 3*12 x = 36
posted on August 20, 2016