Aptitude - Aptitude-Time And Works

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 A does half as much work as B and C does half as much work as A and B together. If C alone can finish the work in 40 days, then together all will finish the work in ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    C alone can finish the work in 40 days.
    (A + B)can do it in 20 days
    (A + B)s 1 days wok = 1/20.
    As 1 days work : Bs 1 days Work = 1/2 : 1 = 1:2.
    A’s 1 day’s work = (1/20) * (1/3) = (1/60). [Divide 1/20 in the raio 1:2] Bs 1 days work = (1/20) * (2/3) = 1/30
    (A+B+c)S 1 day’s work = (1/60) + (1/30) + (1/40) = 9/120 = 3/40
    All the three together will finish it in 40/3 = 13 and 1/3 days.

A can do of the work in 5 days and B can do of the work in 10 days. In how many days both A and B together can do the work ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Whole work will be done by A in (5 x 3) = 15 days.
    Whole work will be done by B m (10 * (5/2)) = 25 days.
    As 1 day’s work = 1/15 and Bs 1 days work = 1/25
    (A+B)s 1 daYs work=((1/15) + (1/25) ) = 8/75
    So, both together can finish it in 75/8 = 9 and 3/8 days days

A and B can together finish a work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days. A alone can finish the work in ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Work done by A and B in 20 days = (1/30 * 20) = 2/3
    Remaining work= ( 1 -2/3) = 1/3 Now,1/3 work is done by A in 20days
    Whole work will be done by A in (20x3) = 60 days.

4 men and 6 women finish a job in 8 days, while 3 men and 7 women finish it in 10 days. In how many days will 10 women working together finish it ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Let 1 mans 1 days work = x and 1 womans 1 days work = y.
    Then, 4x + 6y = 1/8 and 3x+7y = 1/10
    solving, we get y = 1/400
    10 womens 1 day work = 10/400 = 1/40
    10 women will finish the work in 40 days.

A father can do. a job as fast as his two sons working together. If one son does the job in 3 hours and the other in 6 hours, how many hours does it take the father to do the job ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Fathers 1 hours work= (1/3) + (1/6) = 1/2
    Time taken by father to complete the work = 2 hours.

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