Question
A can finish a work in 24 days, B in 9 days and C in 12 days . B and C start the work but are forced to leave after 3 days. The remaining work was done by A in :
Answer: Option C
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(B + C)'s 1 days work = `(1/9 + 1/12) = 7/36`
Work done by B and C in 3 days = `(7/36 xx 3) = 7/12`
Remaining work = `(1 - 7/12) = 5/12`.
Now , `1/24` work is done by A in 1 day
So, `5/12` work is done by A in `(24 xx 5/12)` = 10 days.
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