Quantitative Aptitude :: Time and Work - Discussion

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Explanation:
A's 1 day work = 1/45
B's 1 day work = 1/40

so (A + B)'s 1 day's work = (1/45+1/40)=17/360

Work done by B in 23 days = (140?23)=2340
Remaining work =(1-23/40)=17/40

Now, 17/360 work was done by (A + B) = 1 day.

17/40 part of work was done by (A + B) = (1?360/17?17/40) = 9 days.

A left after 9 days.