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 :
Answer: Option D
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A's 1 days work = `1/15`; B's 1 days work = `1/20`
(A + B)'s 1 day's work = `(1/15 + 1/20) = 7/60`
(A + B)'s 4 day's work = `(7/60 xx 4) = 7/15`
`:.` Remaining work = `(1 - 7/15) = 8/15`
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