If 12 men and 15 boys can do a piece of work in 10 days. Then in how
many days can 15 men and 25 boys do thrice of this work , it being given
that 3 men can do as much work in 2 hours as 5 boys can do in 3 hours.

1) 20 days
2) 25 days
3) 21.6 days
4) 26 days