Mathematics MCQs

Page No. 69

A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in___________?


a8 days


b10 days


c12 days


d15 days


View Answer 12 days

A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?


a80 days


b100 days


c120 days


d150 days


View Answer 120 days

Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman ?


a3 : 4


b4 : 3


c5 : 3


dData inadequate


View Answer 4 : 3

X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ?


a6 days


b10 days


c15 days


d20 days


View Answer 10 days

A and B together can complete a work in 1.2 days,. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work ?


a10 days


b11 days


c15 days


d20 days


View Answer 15 days

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every Third day ?


a12 days


b15 days


c16 days


d18 days


View Answer 16 days

A and B together take 6 days to complete a task. B and C together take 12 days to complete the same task. A and C together take 8 days to complete it. If A, B and C are working together, how long does it take for them to complete the task?


a4(2/3) days


b4 days


c5(1/3) days


d1(1/3) days


View Answer 5(1/3) days

B can work 3 times faster than A. They work together on a task and complete it in a day. How long does it take for B alone to complete the task?


a32 hours


b48 hours


c3 days


d4 days


View Answer 32 hours

4 men and 2 woman can complete a work in 2 days. If 2 men alone take 5 days to complete the work, find the time taken by 2 women alone to complete the work.


a15 days


b10 days


c8 days


d20 days


View Answer 10 days

A and B working separately can do a piece of work in 9 and 12 days respectively. If they work for a day alternately. If A begins first, in how many days the work will be completed ?


a42/4 days


b41/4 days


c55 days


dNone of these


View Answer 41/4 days

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