# If 10 men or 18 boys can complete a work in 15 days, then in how many days, 25 men and 15 boys

If 10 men or 18 boys can complete a work in 15 days, then in how many days, 25 men and 15 boys can complete the double of that work?

(a) 9/2

(b) 9

(c) 36

(d) 18