A. 5 days

**B. 10 days**

C. 15 days

D. 12 days

Work done by P in 1 day = 1/20

Work done by Q in 1 day = 1/12

Work done by P in 4 days = 4 × (1/20) = 1/5

Remaining work = 1 – 1/5 = 4/5

Work done by P and Q in 1 day = 1/20 + 1/12 = 8/60 = 2/15

Number of days P and Q take to complete the remaining work = (4/5) / (2/15) = 6

Total days = 4 + 6 = 10

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### Related Mcqs:

- 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 ?
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D. 45 - P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 50 days to complete the same work. then Q alone can do it in__________?
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**C. 6 days**

D. 8 daysSubmitted by:

**মোঃ আশাদুজ্জামান**

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