Question

12 men can complete a work in 18 days. Six days after they started working, 4
men joined them.
remaining work.
How many days will all of them take to finish the​

Answer 1

Answer:

If 12 men can complete a job in 18 days, it means the job requires the input of 12*18 = 216 man-days.

In six days the work completed is 12*6 = 72 man-days of work. What remains to be done is 216–72 = 144 man-days of work. So if 4 more men are added the work force becomes 16 man, strong.

So the remaining work can be completed in 144 man-days / 16 men = 9 days.

So the work will be completed in 6 + 9 or 15 days from the start or 9 days after the additional 4 men have reported for work.

Answer 2

In 18 days, A can do a piece of work. ∴ In 1 day, A can do (1/18)th part of the work. ∴ In 12 days, A can do 12×(1/18) th part of the work = (12/18) = (2/3)rd part of the work.