Question:A can do a piece of work in 15 days and B alone can do it in 10 days. B work at it for 5 days and then leaves. A alone can finish the remaining work in : 

A `6 1/2` days 
B `7 1/2` days 
C 8 days 
D 9 days 

+ Answer
B 

+ Explanation
solution:
B's 5 day's work = `(1/10 xx 5)`
                           = `1/2`.
Remaining work = `(1 - 1/2)`
                          = `1/2`.
A can do `1/2` work in `7 1/2` days.

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Md. Habib Ullah

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