If 42 men do a work in 25 days, in how many days will 50 men do it?  Choose the most appropriate option.
A) 23
B) 22
C) 19
D) 20
E) 21
42 * 25 = 50 * x   x = 21 days   Answer: 21
<result>E</result>
If 42 men do a work in 25 days, in how many days will 50 men do it?