Question

9 hours a day 7 boys can do a piece of work in 15 days working 5 hours a day how many boys can do in a 20 day

Answer 1

Step-by-step explanation:

m1*d1*h1 = m2*d2*h2

m1 = 7, d1 = 15, h1 = 9; m2=x, d2=20, h2=5

7×15×9 = x×20×25

x = 7×15×9/20×25 = 1.89 approx 2 days