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  Choose the correct choice from the following
A) 4	B) 5	C) 6	D) 8	E) 7
Solution   Let the required number of men be x.   Less days,More men (Indirect Propertion)   More working hrs per days,Less men (Indirect Propertion)   ∴ 8 × 15 × x = 10 × 8 × 12 ⇔ x = 10x8x12/8x15= x= 8. Answer 8
<result>D</result>
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