A) \[10\frac{1}{2}\] days
B) 14 days
C) \[16\frac{1}{2}\]days
D) 21 days
Correct Answer: D
Solution :
1 man = 2 children; because a child takes double time to do work than the man. \[\therefore \]8 men + 12 children = 8 + 6 = 14 men \[\because \]14 men can do a work in 9 days. \[\therefore \]12 men can do the same work in \[\frac{14\times 9}{12}\]days \[\because \]12 men can do twice the work in\[\frac{14\times 9\times 2}{12}=21\]
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