Q.

A and B can together finish a work in 30 days. They worked on 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:

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a

62 days

b

58 days

c

56 days

d

60 days

answer is D.

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Detailed Solution

A and B can together finish a work= 30 days.

One day work of A and B =130

20 days work of A and B =2030

Remaining work =12030=13work

13work was done by A alone = 20 days

 Whole work was done by A alone = 20x3 = 60 days

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