If 4 men and 1 boy working together, can do two 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? Pick one:	A) 3 : 2	B) 2 : 1	C) 3 : 3	D) 1 : 2	E) 6 : 1

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