If 10 men do a work in 80 days, in how many days will 20 men do it?	Choose the most appropriate option:
A) 18 days  B) 38 days  C) 40 days  D) 48 days  E) 50 days
10 * 80 = 20 * x   x = 40 days   ANSWER:40 days
<result>C</result>
If 10 men do a work in 80 days, in how many days will 20 men do it?