Twenty four men can do a work in 35 days. How many men are required to complete the work in 21 days?
Choices:	A) 22	B) 40	C) 277	D) 26	E) 12
We have M1 D1 = M2 D2   So, 24 * 35 = M2 * 21 =&gt; M2 = 40.   Answer:40
<result>B</result>
Twenty four men can do a work in 35 days. How many men are required to complete the work in 21 days?