A work can be finished in 30 days by twenty women. The same work can be finished in fifteen days by 10 men. The ratio between the capacity of a man and a woman is Pick one:
A) 1:3
B) 4:1
C) 2:3
D) 2:1
E) 2:4
Work done by 20 women in 1 day = 1/30   Work done by 1 woman in 1 day = 1/(30×20)   Work done by 10 men in 1 day = 1/15   Work done by 1 man in 1 day = 1/(15×10)   Ratio of the capacity of a man and woman =1/(15×10) : 1/(30×20) = 1/150 : 1/600   = 1/1 :1/4 = 4:1   Option 4:1
<result>B</result>
A work can be finished in 30 days by twenty women. The same work can be finished in fifteen days by 10 men. The ratio between the capacity of a man and a woman is