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Question

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days then the fraction of the work that is left is:


A

14

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B

110

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C

715

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D

815

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Solution

The correct option is D

815


A’s 1 day’s work = 115;
B’s 1 day’s work = 120.

(A+B)’s 1 day’s work = (115+120)=760

(A+B)’s 4 days’ work = (760×4)=715

Remaining work will be the difference between the whole work and the work done by both in 4 days.

∴ Remaining work = (1715)=815


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