12 men can complete a work within 9 days. After 3 days they started the work, 6 men joined them to replace 2 men. How many days will they take to complete the remaining work?
Correct Answer: 41/2
Explanation:
12 men can complete 1/3 of the work in 3 days and the remaining 2/3 of the work in 6 days.
1 man can complete 2/3 of the work in (12 x 6) = 72 days
∴ (12 - 2 + 6) = 16 men can complete 2/3 of thye work in 72/16 = 41/2 days
