Question
A and B can do a Job together in 7 days. A is `1 3/4` times as efficient as B. The same job can be done by A alone in :
Answer: Option B
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(A's 1 day work ) : (B's 1 days work ) = `7/4` : 1 = 7 : 4
Let A's and B's 1 day's work be 7`x` and 4`x` respectively.
Then , 7`x` + 4`x` = `1/7 rArr 11x = 1/7 rArr x = 1/77`
`:.` A's 1 day's work = `(1/77 xx 7) = 1/11`
Hence , A alone can finish the work in 11 days.
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