# kumar

Most popular questions and responses by kumar
1. ## chemistry

The atomic mass of Eu is 151.96. There are only two naturally occurring isotopes of europium, 151Eu with a mass of 151.0 and 153Eu with a mass of 153.0. The natural abundance of the 131Eu isotope must be approximately

2. ## maths

Ram divided a sum of Rs.3873 among his three sons. His youngest son got 35% less than his oldest son who got 35% more than his second son. Find the share of his second son

3. ## maths

A teacher driving his vehicle at 24 kmph reaches her school 5 minutes late.If She had driven the vehicle 25% faster on an average she would have reached 4 minutes earlier than the scheduled time. How far is her school ?

4. ## maths

sinA+cosA=p and secA+CosecA=q then show that q[p^2-1]=2p

5. ## Sociology

The difference between positivism and anti -positivism relates to: a. whether individuals like or dislike their society b. whether research methods use statistical data or person-to-person research c. whether sociological studies can predict or improve

6. ## maths

By increasing the speed of a car by 10km/hr the time of journey for a distance of 72 km is reduced by 36 min. Find the original speed of the car ?

7. ## maths

In a class of 50 students 25 take hindi and 16 take marathi.12 students take no languages. Find how many takes both hindi and marathi.

8. ## maths

A wheel revolves 1254 times in travelling a distance of 2kms 5 hectometers and 8 meters .find the circumference of the wheel .

9. ## MATH

missy and missy are messy sisters. their dresser drawer consists of 43 white socks, 2 black socks, 23 blue socks and 8 red socks. What is the minimum number of socks they must remove from the drawer to be certain they have four socks of the same color?

10. ## Math

4x+6y=1/8+3x+7y=1/10

11. ## maths

a woman is four times older than her daughter five years ago the product of their age was 175 find their present age

12. ## maths

sin^2 28*+ sin^2 62* + tan^2 38*- cot^2 52*+ 1/4 sec^2 30* = ?

13. ## maths

If cosA + sinA= root2 cosA Show that cosA - sinA= root2 sinA

14. ## Chemistry

What is the pH of a buffer solution of 0.125M Acetic acid and 0.250M Sodium acetate? the Pk of Acetic acid is 4.76

15. ## maths

Prove that [1+cotA-CosecA] [1+tanA+secA] = 2

16. ## maths

Raman completes 50% of a wk in 10 days. Mohan then joins Raman on the 11th day and they together complete the remaining wk in 2 days.How long will take if the entire wk is entrusted to Mohan alone ?

17. ## maths

1.Without using Pythagorus theorm, prove that the points (-4,-3), (-2,2),(8,-2)are the vertices of a right angled triangle. 2. The 3 vertices of a parallelogram taken in order are (3,4),(-2,3), (-3,-2).Find the coordinates of the fourth vertex ?

18. ## maths

A man covered a certain distance at some speed. Had he moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. The distance (in km) is:

19. ## maths

4 men & 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it?

20. ## maths

1.Without using Pythagorus theorm, prove that the points (-4,-3), (-2,2),(8,-2)are the vertices of a right angled triangle. 2. The 3 vertices of a parallelogram taken in order are (3,4),(-2,3), (-3,-2).Find the coordinates of the fourth vertex ? can u pl

21. ## maths

A train travels 360 km at uniform speed . if the speed had been 5 km / hr more it would have taken 1 hour less for the same journey. find the speed of the train. pl give me a short cut method to solve.

22. ## maths

A flower garden has three times as many red roses as pink roses. Twice the number of red roses is equal to four times the number of pink roses increased by ten. How many red roses are there? How many pink roses are there?

24. ## maths

Find four numbers in AP whose sum is 20 and sum of whose squares is 120.

25. ## chemistry

For the reaction Al (s) + 3 HCl (aq) à AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The DHo for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d) –

26. ## maths

A and B entered into partnership with capitals in the ratio 4: 5. After 3 months, A withdrew ¼ of his capital and B withdrew 1/5 of his capital. The gain at the end of 10 months was Rs. 760. A's share in this profit is:

27. ## maths

If square of a number ends with 5,then its cube ends with 25 . Is the statement correct ?

28. ## maths

Prove SinA/1-CosA = CosecA + CotA

29. ## maths

If the cost price of an item is 25% of its selling price , what is the % of profit ?

30. ## maths

A sum of money becomes 3 times of itself in 20 years. Find its rate of interest?

31. ## maths

An arithmetic progression has 10 terms. Sum of the 10 terms is 220. Sum of the odd terms is 100. Find the first term and common difference. pl give me the answer.

32. ## math

If y = 18x+5 is the regression line of x on y then the value of bxy is what ?

33. ## marketing

What resources does an International Internet retailer need other than merely a storefront on the Internet? Does it require fewer physical, financial, and human resources than a traditional retailer, or just as many? Explain.

34. ## maths

With a uniform speed a car covers a certain distance in 8 hrs. If the speed of the car is increased by 4 km per hour , the same distance can be covered in 7 1/2hrs.Find the distance covered ?

35. ## maths

At a flower shop , there was a total of 494 sunflowers and roses. After 2/5 of sunflowers and 57 roses were sold , the ratio of number of sunflowers to number of roses were 2:3. How many roses were there at first?

36. ## maths

Of three numbers, second is twice the first and is also thrice the third. If the average of three numbers is 44, find the largest.

37. ## maths

If a/b =c/d , show that a^3c + ac^3 = (a+c)^4 ----------- ------- b^3d + bd^3 (b+d)^4 pl help.

38. ## maths

An arithmetic progression has 10 terms. Sum of the 10 terms is 220. Sum of the odd terms is 100. Find the first term and common difference. pl give me the answer. maths - Steve Monday, July 17, 2017 at 12:11pm 10/2 (2a+9d) = 220 5/2 (2a+4*2d) = 100 maths -

39. ## maths

A number on being divided by 10 and 11 successively leaves the remainders 5 and 7. Find the number.

40. ## MATH

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as abã−cƒÎ, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value

41. ## math

(x/2)+(x/4)+(x/8)=(x-(1/2)) variable domain {(5/7),(6/7),(4/8),(3/7),(2/7)

42. ## maths

A and B entered into partnership with capitals in the ratio 4: 5. After 3 months, A withdrew ¼ of his capital and B withdrew 1/5 of his capital. The gain at the end of 10 months was Rs. 760.Find A's share in this profit ? Anybody plz help me.

43. ## maths

A and B entered into partnership with capitals in the ratio 4: 5. After 3 months, A withdrew ¼ of his capital and B withdrew 1/5 of his capital. The gain at the end of 10 months was Rs. 760.Find A's share in this profit ?

44. ## maths

What time will a runner take to run a distance of 8 km at a speed of 15 km/hr?

45. ## maths

If [x-y]^2=12 , and xy=2 . Find x^2+y^2. pl help.

46. ## maths

posted by kumar Thursday, March 15, 2018 at 11:51am. 4 men & 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it? maths - Reiny Thursday, March 15, 2018 at 1:50pm man's rate

47. ## maths

A and B can do a piece of work in 10 days, B and C in 15 days and A and C in 12 days. A,B and C work together to finish the work. If they are paid 15000, find the share of each?

48. ## maths

Show that [1+1/tan^2A][1+1/cot^2A] = 1/sin^2A-sin^4A

49. ## maths

he sum of two numbers is 15 the sum of the squares of the same two numbers is 172 fined the difference between the two numbers

50. ## maths

X and Y can together complete a wk in 3 days. If X alone can complete the work in 9 days. In how many days can Y alone complete the work ?

51. ## maths

At what rate of % per annum, will the simple interest on a sum of money become 3/4 of the principal in 6 yrs ?

52. ## maths

20 % of [(7+5-3/12)-6] = ?

53. ## maths

If 6men can do a piece of work in 20 days and one man can do a work of 2 boys.Find how many days can 10 men and 5 boys do the same work ?

54. ## maths

If a/b =c/d , a^3c + ac^3 = (a+c)^4 show that ----------- ------- b^3d + bd^3 (b+d)^4 pl help.

55. ## m

which of the following fraction is greater than 3/4 and less than 5/6.

56. ## maths

HELP ME PLEASE ---- + ------ + ------- = 30 [Using numbers 1,3,5,7,9,11,13 &15]

57. ## maths

A number on being divided by 10 and 11 successively leaves the remainders 5 and 7. Find the number. ie, x/10 = remainder 5 and x/11 = remainder 7. please help me to find the value of x.

58. ## english

Bill Gates didn't _______ ( seem )like a shoe-in for success after dropping out of Harvard and starting a failed first bussiness with Microsoft co- founder Paul Allen ______ ( Call ) Traf O- Data . While this early idea didn't work , Gates ' later , ______

59. ## pcm

sir ple. tell me how to make 9v dc motor how many coil turns i have to make.

1. ## Math

3/10+2/100+6/1000

posted on October 5, 2018
2. ## maths

ok

posted on October 4, 2018
3. ## maths

SIR, HOW WILL U GET THE ANSWER ?

posted on October 4, 2018
4. ## maths

Thank you sir.

posted on September 30, 2018
5. ## Math

Non english books = 650*2/5=130*2=260 books.

posted on September 30, 2018
6. ## maths

Given F1= -4 So F15= F1+14d=-4+14d=2[F1+4d]=2F1+8d -4+14d=2*-4+8d=-8+8d 14d-8d=-8+4 6d=-4 d=-4/6=-2/3 F12=F1+11d=-4+11*2/3=-4+22/3=-12+22/3=10/3=3 1/3

posted on August 19, 2018
7. ## maths

thank you sir.

posted on March 17, 2018
8. ## maths

[x-y]^2= x^2+y^2-2xy 12= x^2+Y^2-2*2 So, x^2+Y^2=12+4=16 Is this correct sir ?.

posted on March 17, 2018
9. ## maths

ok. so 4 men & 6 women takes = 8 days, 3 men & 7 women takes = 10 days. and 10 women takes = 400 days. thankyou sir.

posted on March 17, 2018
10. ## maths

posted by kumar Thursday, March 15, 2018 at 11:51am. 4 men & 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it? maths - Reiny Thursday, March 15, 2018 at 1:50pm man's rate

posted on March 17, 2018
11. ## maths

I have one more doubt. if the work is same, then [ 4m+6w]8 = [3m+7w]10 32m+48w = 30m+70w 2m=22w : 1m=11w put it in equation 3m+7w=10 33w+7w=40w=10days so,10 women = 40 days. out of these 2 answers which one is correct ? Sir, plz advice.

posted on March 16, 2018
12. ## maths

thankyou sir. sir, any other simple way to solve this pblm.

posted on March 16, 2018
13. ## maths

ok. Thank you sir. I have a doubt. 4m+6w=8 ........[1] 3m+7w=10 ......[2] [2]*4 = 12m+28w=40 [1]*3 = 12m+18w=24 ......................................... [2]-[1]= 0 + 10W = 16 Days. Is it correct ? plz advice.

posted on March 16, 2018
14. ## maths

Thankyou very much sir.

posted on March 12, 2018
15. ## maths

yes. I Got the answer. 10 and 40. Thankyou. Sir,any short cuts for solving this pblm.

posted on March 5, 2018
16. ## maths

pl help

posted on February 26, 2018
17. ## Math

a+b=1250 a+c=1060 ----------------- 2a+b+c =2310 - b+c =1830 -------------- 2a =480 a =240 240+b =1250 b =1010 240+c =1060 c= 820.

posted on February 4, 2018
18. ## maths

ok.I got it. 20% of 5 is 1. so 1+ 46 = 47. option [d].

posted on February 4, 2018
19. ## maths

5+ 8 [(12-1/4)-6] 5+ 8 [48-1/4) -6] 5+ 8 [47/4-6] 5+ 8 [47-24/4] 5+ 8 [23/4] 5+ 8*23/4 5+ 46 = 51 ??

posted on February 4, 2018
20. ## maths

sorry . correction in the question. 20 % of 5+ 8 [(7+5-3/12)-6] = ? Plz help. Ans. [a] 89 [b] 84 [c] 44 [d] 47

posted on February 4, 2018
21. ## maths

If the smallest number is x. 3x + [3x-3] + x = 35>

posted on September 24, 2017
22. ## maths

Thank u sir.

posted on August 24, 2017
23. ## maths

pl explain how can we find z. what is the answer.

posted on August 24, 2017
24. ## Maths

if bundle means basket,then number of books = 144 * 100 = 14400

posted on July 30, 2017
25. ## MATH

Take LCM of 18,25,and 35 = 3150 multiplied by 3 = 3150 * 3 = 9450

posted on July 30, 2017
26. ## maths

sorry.its my mistake. 10/2(2a+9d)=220 5 (2a+9d)=220 (2a+9d)=220/5=44..........[1] 5/2(2a+4x2d)=100 2.5(2a+8d)=100 (2a+8d)=100/2.5=40.......[2] [1]-[2]=d=4 :. 2a+32=40 a=4

posted on July 19, 2017
27. ## maths

sir, I get the answer First term = 18.4 common difference = 4/5 is it correct ?

posted on July 18, 2017
28. ## Physics

Question

posted on June 28, 2017
29. ## math

Following Ms.Sue's steps the answer =33 - 23 = 10 & = 49/42 - 24/42 = 25/42. So ie. = 10 25/42.

posted on September 4, 2016
30. ## Algebra

116cm - 40 = 76cm. 76cm/2 = 38cm. length of 1st pieces = 38cm. length of 2nd pieces = 38cm+40cm =78cm

posted on September 4, 2016
31. ## math

X+y= -62 2x+y = 41 ------------------ 2x+2y= -124 2x+y= 41 - - - --------------------- Y= 175

posted on September 28, 2015
32. ## waste water treatment

Screen Grit chamber Primary sedimentation Anaerobic tank Anoxic tank Aerobic tank Final clarifier Sludge dewatering

posted on March 20, 2015
33. ## waste water treatment

Q2: The maximum sludge concentration in the return flow will increase, reducing biomass storage in the final clarifier during rwf, decreasing the chance for biomass wash out. The biomass concentration in the aeration tank can increase, which could lead to

posted on March 20, 2015
34. ## water treatment

What is the main advantage of a lower SVI? The maximum sludge concentration in the return flow will increase, reducing biomass storage in the final clarifier during rwf, decreasing the chance for biomass wash out. The biomass concentration in the aeration

posted on March 20, 2015
35. ## water treatment

What is correct for the aerobic granules of a Nereda system: Denitrification takes place inside the granule Due to reduction of oxygen in the outer layer, anoxic conditions will exist inside the granule Aerobic granules make settling tanks superfluous

posted on March 20, 2015
36. ## waste water treatment

QUESTION 2C-1: Calculate V in m/s is 1.22 QUESTION 2C-2: Calculate at which open screen area (m2) this velocity is reached - 0.34 Calculate what percentage of the clean free space is clogged ... 32 QUESTION 2D-1: Determine how many parallel channels 4 What

posted on March 20, 2015
37. ## Water Treatment

The answers given by "Water Treatment - Ham, Sunday, November 24, 2013 at 10:24pm" is correct - Thanks Dear

posted on March 20, 2015
38. ## Chemistry

works

posted on January 26, 2015
39. ## Sociology

I thought the same too but I was not sure. That was why I asked here. Thanks!

posted on August 17, 2014
40. ## Physics

0.001 is wrong @MARC , did u got green check with that value ??? plz help ???

posted on December 16, 2013
41. ## Physics

hai anonymous ,i stuck on dis question if u done for it plz help ???

posted on December 16, 2013