12 men working 8 hours per day complete a piece of work in 10 days. To complete the same work in 8 days, working 15 hours a day, the number of men required, is

A 4
B 8
C 5
D 6

Correct Answer: 8

"Let the required number of men be x Less days, More men (Indirect Proportion) More working hrs per day, Less men (Indirect Proportion) Days 8 : 10 Working hrs 15 : 8 :: 12 : x ⇒8×15×x = 10×8×12⇒x = 10×8×128×15⇒x = 8
Bissoy MCQ
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