12 men complete a job in 9 days. How many men working t the same rate would be required to complete the job in 6 days?

A.
24 
B.
18 
C.
12 
D.
9 
E.
8
Correct Answer: Option B
Explanation
12 men in 9 days,
1 day in (12 times 9) men
In 6 days we have (frac{12 times 9}{6}) men
= (frac{108}{6})
= 18 men