∵ In 10 days a work is complete by 15 men
∴ In 1 day a work is complete by = 15 x 10 = 150 men
∵ In 5 days the work is complete by = 20 boys
∴ 1 day the work is completed = 20 x 15 = 300 boys
⇒ 150 men = 300 boys
or 1 men = 300/150 = 2 boys
10 men = 2 x 10 = 20 boys
10 men + 10 boys = 20 + 10 = 30 boys
∵ 20 boys complete the work in 15 days
∴ 30 boys complete the work in (15 x 20)/30 = 10 days
