A is twice as good a work man as B and together they finish the work in 14 days. In how many days A alone can finish the work? Select.
A) 20 B) 21 C) 22 D) 23 E) 24
Explanation:   WC = 2:1   2x + x = 1/14 =&gt; x = 1/42   2x = 1/21   A can do the work in 21 days.   Answer: 21
<result>B</result>
A is twice as good a work man as B and together they finish the work in 14 days. In how many days A alone can finish the work?