150 men in 25 days do = work
Let 1 man in 1 day does = x work
Total work done by 150 men in 25 days = 150x * 25 = work => x =
Therefore, 100 men in 60 days do = 100 * 60x = 6000x work = 6/15 = 2/5
Total work done =
Therefore, Remaining work = 1 - =
Remaining time = 130 - (25+60+10) = 35 days
Therefore, work is done in 25 days by 150 men.
Therefore, Work is done in 35 days by 150 men.
Hence, he should employ 50 more men.