Question

15 workmen can complete a piece of work in 12 days working 10 hours a day. How many workmen should be added to complete the same work in 6 days working 12 hours a day?​

Answer 1

120 hours is the time that 15 workers take to finish the job
By proportion miner of workers need to complete job in 72 hours is
15 * 120/72
= 15* 5/3
= 25.

Answer 2

25 workmen

Explanation:

C = work completion

Half the number of days

6/5 (= 12/10) the hrs/day

½ × 6/5 × C = ⅗C

C/(⅗C) = 5/3

5/3 × 15 = 25