10 men working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days ?

A. 6 hours/day

B. 10 hours/day

C. 12 hours/day

D. 15 hours/day

Answer: Option A

Solution(By Examveda Team)

$$\eqalign{ & \frac{{{{10}_{{\text{men}}}} \times {6_{{\text{hours}}}} \times {{18}_{{\text{days}}}}}}{{{1_{{\text{work}}}}}} = \frac{{{{15}_{{\text{men}}}} \times {{12}_{{\text{days}}}} \times {\text{H hour/day}}}}{{{1_{{\text{work}}}}}} \cr & \Leftrightarrow {\text{6 hours/day}} \cr} $$