A work can be finished in 30 days by 30 women. The same work can be finished in fifteen days by 15 men. The ratio between the capacity of a man and a woman is	Choose the correct choice from the following.
A) 1:3	B) 4:3	C) 2:3	D) 4:1	E) 2:4
Work done by 30 women in 1 day = 1/30   Work done by 1 woman in 1 day = 1/(30×30)   Work done by 15 men in 1 day = 1/15   Work done by 1 man in 1 day = 1/(15×15)   Ratio of the capacity of a man and woman =1/(15×15) : 1/(30×30)) = 1/225 : 1/900   = 1/1 :1/4 = 4:1   Option 4:1
<result>D</result>
A work can be finished in 30 days by 30 women. The same work can be finished in fifteen days by 15 men. The ratio between the capacity of a man and a woman is