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

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b10 days

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c12 days

✓


d15 days

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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

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b100 days

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c120 days

✓


d150 days

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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

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b4 : 3

✓


c5 : 3

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dData inadequate

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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

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b10 days

✓


c15 days

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d20 days

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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

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b11 days

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c15 days

✓


d20 days

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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

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b15 days

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c16 days

✓


d18 days

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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

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b4 days

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c5(1/3) days

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d1(1/3) days

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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

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b48 hours

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c3 days

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d4 days

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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

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b10 days

✓


c8 days

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d20 days

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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

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b41/4 days

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c55 days

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dNone of these

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View Answer 41/4 days

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