if 7 men and 2 boys working together , can do 6 times as much work per hour as a man and a boy together . find the ratio of the work done by a man and that of a boy for a given time ?
Select the correct option:	A) 2 : 5	B) 2 : 3	C) 1 : 8	D) 4 : 1	E) 3 : 2

Rationale: 7 m + 2 b = 6 ( 1 m + 1 b ) 7 m + 2 b = 6 m + 6 b 1 m = 4 b the required ratio of work done by a man and a boy = 4 : 1 answer : d
Answer: D