15 men can work a do in 12 days. How long it will take 9 men to do work...? Mcqs

15 men can work a do in 12 days. How long it will take 9 men to do work...?

(A) 20

(B) 14

(C) 9

(D) none of these

Source: This question is taken from the ASF Corporal Past Paper Batch 1