9 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio  Choose the correct choice from the following options
A) 1:2	B) 1:3	C) 2:1	D) 2:5	E) None of these
Explanation:   Let 1 man 1 day work = x   1 boy 1 day work = y   then 9x + 2y = 4(x+y)   =&gt; 5x = 2y   =&gt; x/y = 2/5   =&gt; x:y = 2:5   Option 2:5
<result>D</result>
9 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio