12 men can finish work in 40 days. if 4 men join, how many days will it take?
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Answer:
Total work = 20 x 40 mandays.
16 people work for 48 days completing 16 x 48 mandays of work.
Remaining work done by 4 men in :
( 20 x 40 - 16 x 48 )/4 = 32/4 = 8 days
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