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Directions: Study the following questions carefully and choose the right answer:

  • 1.
    A is twice as good as B and together they finish a piece of work in 16 days. The number of days taken by A alone to finish the work is
    A. 20 days B. 21 days
    C. 22 days D. 24 days

  • 2.
    15 men take 20 days to complete a job working 8 hours a day. The number of hours a day should 20 men take to complete the job in 12 days
    A. 5 hours B. 10 hours
    C. 15 hours D. 18 hours

  • 3.
    Raj and Ram working together do a piece of work in 10 days. Raj alone can do it in 12 days. Ram alone will do the work in
    A. 20 days B. 40 days
    C. 50 days D. 60 days

  • 4.
    A can do a piece of work in 20 days and B in 30 days. They work together for 7 days and then both leave the work. Then C alone finishes the remaining work in 10 days. In how many days will C finish the full work ?
    A. 25 days B. 30 days
    C. 24 days D. 27 days

  • 5.
    A, B and C can do a job in 6 days, 12 days and 15 days respectively. After 1/8 of the work is completed, C leaves the job. Rest of the work is done by A and B together. Time taken to finish the work is
    A.
    5 5  days
    6
    B.
    5 1  days
    4
    C.
    3 1  days
    2
    D.
    3 3  days
    4