Most popular questions and responses by XYZ
  1. math

    A shopkeeper bought pens at a rate of 12 pens for 150 rs and sold them at rate of 10 pens for 130rs.The number of pens he should sell to earn a net profit of 20rs is?

    asked on November 22, 2017
  2. Physics

    two charges of 40 microc and -20 micro c are placed at a certain distance apart. they are touched and kept at the same distance.the ratio of their initial to the final force between them is

    asked on November 9, 2016
  3. Statistics

    Suppose that in the city in which the survey is conducted, 50% of adults are married, 15% are single, 25% are divorced, and 10% are widowed. a. Assign probabilities to each simple event in the sample space. b. Which approach did you use in part (a)? Find

    asked on February 4, 2016
  4. science

    what is the reaction between hexane & iodine?

    asked on May 11, 2010
  5. Math Probability

    Let X and Y be independent random variables, each uniformly distributed on the interval [0,2]. Find the mean and variance of XY. E[XY]=   var[XY]= Find the probability that XY≥1. Enter a numerical answer. P(XY≥1)=

    asked on May 20, 2014
  6. math

    The ratio of Jim’s money to Peter’s money was 4 : 7 at first. After Jim spent half of his money and Peter spent $60, Peter had twice as much money as Jim. How much money did Jim have at first?

    asked on March 3, 2017
  7. Chemistry

    A toothpaste contains 0.220 % by mass sodium fluoride used to prevent dental caries and 0.32 % by mass triclosan C12H7Cl3O2, an antigingivitis agent. One tube contains 119 g of toothpaste. How many fluoride ions, F−, are in the tube of toothpaste? How

    asked on November 27, 2015
  8. Physics

    A block of mass m1 is on top of a block of mass m2. Block 2 is connected by an ideal rope passing through a pulley to a block of unknown mass m3 as shown. The pulley is massless and frictionless. There is friction between block 1 and 2 and between the

    asked on June 22, 2013
  9. math

    A shopkeeper allows a discount of 10% on the marked price of a commodity which he bought at 540rs.Had he sold at marked price,he would have made a profit of 210rs.what is present sp of a commodity? ans(675rs)

    asked on November 22, 2017
  10. Statistics

    A survey asks adults to report their marital status. The sample space is S = {single, married, divorced, widowed} . Use set notation to represent the event the adult is not married. This is what I think is the answer Married = {single, divorced, widowed}

    asked on February 3, 2016
  11. math

    Today,aditi is as old as barkha will be 9 yr from now.5 yrs ago,aditi was 1.5 times as old as barkha was at that time.what will be the sum of ages of aditi and barkha 4 yr hence?

    asked on September 20, 2017
  12. physics

    Two construction workers each of mass m raise themselves on a hanging platform using pulleys as shown above. If the platform has a mass of 0.5m, the initial distance between the pulleys and the platform is d, and the workers each pull with a force f on the

    asked on June 22, 2013
  13. Algebra

    A red ribbon is 2x cm long. A blue ribbon is 3 times long as the red ribbon. What is the total length of the ribbon?

    asked on February 23, 2016
  14. chemistry

    how to balance this partial equation given below k2cr2o7+h2so4+kI-->k2so4+cr2(so4)3+h2o+I2

    asked on May 12, 2015
  15. math

    A shop-keeper sells onions at Rs 24, Rs 30 and Rs 42 a kilogram, selling the different kinds in quantities proportional to 1: 1: 3. If the total quantity sold be 60 kg, the average price obtained for each kg is:

    asked on November 22, 2017
  16. chemistry

    how to balance this partial equation given below k2cr2o7+h2so4+kI-->k2so4+cr2(so4)3+h2o+I2

    asked on May 12, 2015
  17. Maths Probability

    Let θ be an unknown constant. Let W1,…,Wn be independent exponential random variables each with parameter 1. Let Xi=θ+Wi. What is the maximum likelihood estimate of θ based on a single observation X1=x1? Enter your answer in terms of x1 (enter as

    asked on May 20, 2014
  18. Maths Probability

    Consider a Markov chain X0,X1,X2,É described by the transition probability graph shown below. The chain starts at state 1; that is, X0=1. 1recurs p=.75 1to 2 p= .25 2to 1 p = .375 2 recurs p=.25 2 to 3 p = .375 3 to 2 p = .25 3 recurs p = .75 Find the

    asked on May 20, 2014
  19. physics

    calculate the maximum increase in photon wavelength that can occur during Compton Scattering. (answer in pm).

    asked on July 7, 2010

    QUIZ 1 AND 2, PROBLEM 3 A block of mass M is pulled with a rope that exerts a force of a magnitude F, causing it to slide over horizontal ground with kinetic coefficient of friction μ (use "mu" when you input your answer). The force is applied at angle θ

    asked on June 29, 2013
  21. Statistics

    A school is running a raffle. There are 100 tickets, of which 3 are winners. You can assume that tickets are sold by drawing at random without replacement from the available tickets. Teacher X buys 10 raffle tickets, and so does Teacher Y. Find the chance

    asked on April 25, 2013
  22. math

    A,B,C contract a work for 1020.together A and B are supposed to do 9/17 of much C get? ans 480rs

    asked on November 24, 2017
  23. physics

    Stuck on this homework problem, any help would be appreciated. Thank you!! A truck has 5.9L diesel engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression

    asked on May 5, 2014
  24. Physics

    The cylindrical bar in the figure has a total length L=1.2 m, a diameter d=15 mm, and is confined by fixed supports at the walls A and B. A concentrated axial load FC=30 kN is applied to the bar at point C as indicated in the figure, with LAC>LBC. The bar

    asked on May 11, 2013
  25. pre cal

    how do you solve f(x)= G(X) and find the points of intersection of the graphs of the 2 functions f(x)= x^2 + 5x+ 13 g(x)= 19

    asked on October 26, 2011
  26. math

    (a) Mr. Smith divides a sum of money between his three children Alex, Billy and Charlie in the ratio 3 : 2 : 7. If Charlie received $120 more than Alex, how much money did Billy receive?

    asked on March 3, 2017
  27. Algebra

    Express in mathematical form using two variables(x,y) the sum of the numerator and the denominator of a fraction is greater by 1 than thrice the numerator

    asked on February 5, 2016
  28. Math Finance

    We have two independent investments. Each of them may have a 1% chance of a loss of 10 million dollars, a 2% chance of a loss of 5 million, a 3% chance of a loss of 1 million, and a 94% chance of a profit of 1 million. (Express all the following answers in

    asked on May 20, 2014
  29. pre cal

    how do you solve f(x)= G(X) and find the points of intersection of the graphs of the 2 functions f(x)= x^2 + 5x+ 13 g(x)= 19

    asked on October 26, 2011
  30. ABC

    BusinessWeek, in an article dealing with management, wrote, “When he took over the furniture factory three years ago…[the manager] realized almost immediately that it was throwing away at least $100,000 a year worth of wood scrap. Within a few weeks,

    asked on January 18, 2010
  31. math

    A piece of cloth is sold for rs85.80 at a profit of 30%. if it had been sold at rs 7.50 per m ,the profit would have been rs 16.50.the length of the piece is ?

    asked on November 22, 2017
  32. math

    Smokers. A life insurance company found that among its last 200 claims, there were six dozen smokers. What is the ratio of smokers to nonsmokers in this group ...

    asked on March 26, 2017
  33. math

    You bought two varieties of rice, costing 5 cents per ounce and 6 cents per ounce each, and mixed them in some ratio. You then sold the mixture at 7 cents per ounce, making a profit of 20 percent. What was the ratio of the mixture?

    asked on March 3, 2017
  34. algebra


    asked on August 21, 2011
  35. math

    when price of article was decreased by 12%, 2 more articles could be bought for rs2160.find original price of article?

    asked on November 22, 2017
  36. math

    points] Two alloys A1 and A2 are composed of two basic elements. The ratios of the compositions of the two basic elements in A1 and A2 are 5 : 3 and 1 : 2, respectively. A new alloy is formed by mixing the two alloys A1 and A2 in the ratio 4 : 3. What is

    asked on March 3, 2017
  37. math

    (b) If I give you $40 then the ratio of my money to yours is 4 : 5. On the other hand, if you give me $40, then the ratio is 8 : 1. How much money do both of us have?

    asked on March 3, 2017
  38. physics

    Imagine a boat is being rowed upstream where v1 is the velocity of the boat and v2 is the velocity of the stream. What is the time required if the boat tends to cross the river along the shortest path?

    asked on October 8, 2016
  39. Maths

    if area of rectangular plot is 1250 sq cm. a smaller rectangular plot with area 1/5 of the total area and length is 7 times of its breath, find the perimeter of the smaller plot

    asked on October 2, 2015
  40. math

    car m takes 5hr to travel from point a to would have taken 6 hr,if same car had travelled the same distance at a speed which was 15km/hr less than its original speed.what is distance between a and b ? (ans 450 km)

    asked on November 20, 2017
  41. math

    if X:Y =A:B show that Y:B=(X+Y):(A+B)

    asked on March 26, 2017
  42. math

    If x : y = a : b, prove that x : y : (x + y) = a : b : (a + b)

    asked on March 3, 2017
  43. math

    The ratio of marks obtained by Ashpreet and Bhupinder on an exam is 6 : 5. If the combined average of their percentage scores is 68.75%, and the sum of their marks is 275, what was the exam out of?

    asked on March 3, 2017
  44. Finance

    Select the right statement(s). A coherent measure of risk is: Sub-additive Possibly Homogeneous Translation Invariant Concave Monotone

    asked on May 20, 2014
  1. science

    How fool completely wrong answer you confused more than before you idiot If u don't know how to solve don't post the solution bloody hell

    posted on October 20, 2018
  2. physics


    posted on August 21, 2018
  3. math

    sir could you please explain this problem

    posted on November 24, 2017
  4. math

    thanku mam

    posted on November 22, 2017
  5. math

    Mam, answer 120.But i dont know...

    posted on November 22, 2017
  6. math


    posted on November 22, 2017
  7. Math Really Hard

    this is wrong

    posted on May 11, 2017
  8. physics

    Anybody answer please

    posted on December 17, 2016
  9. Algebra


    posted on November 4, 2016
  10. math

    Does anyone know the answer

    posted on July 6, 2015
  11. chemistry

    ghnftght ftg4rgt rtfr4f few4tfr vrhy6hh nrhrgbfbgtr5y5n bhbt56yht

    posted on May 11, 2015
  12. Maths Probability

    6. 34/120

    posted on May 20, 2014
  13. Probability

    1. 0.125 2. 1/8 3. ??? 4. 0.0608 5. 1/8 6. ???

    posted on May 20, 2014
  14. Maths Probability

    1. 0.125 2. 1/8 3. ??? 4. 0.0608 5. 1/8 6. ??? Any help?!

    posted on May 20, 2014
  15. Probability

    anyone? Im badly stuck on this :(

    posted on March 9, 2014
  16. Physics Classical Mechanics

    sorry b)

    posted on November 10, 2013
  17. Physics Classical Mechanics


    posted on November 8, 2013
  18. physics

    thank u very much elena ..that was a great help..! :)

    posted on October 7, 2013
  19. chemistry

    convert the solubility to Moles per Litre.

    posted on December 20, 2012
  20. chem


    posted on March 9, 2012
  21. chem

    Is the concentration of A^- just 0.079 then?

    posted on February 22, 2009
  22. English

    nice anwer

    posted on January 4, 2009