If 5 men and 2 boys working together, can do four 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?
Choose the correct choice from the following answers:  A) 2:5  B) 2:3  C) 2:8  D) 2:1  E) 2:2
5M + 2B = 4(1M + 1B)   5M + 2B = 4M + 4B   1M = 2B   The required ratio of work done by a man and a boy = 2:1   Answer:2:1
<result>D</result>
If 5 men and 2 boys working together, can do four 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?