Question

25 women working 12 hours a day can complete a work in 36 days. Then, 20 women must ……….. work hours to complete the same work in 30 days.

Answer 1

Let the required hours be x

As women increases hours to work decreases

∴ It is an inverse proportion.

∴ Multiplying factor is 25/20

As days increases hours needed become less

∴ It is also an indirect variation.

∴ Multiplying factor is 36/30

∴ x = 12 × 25/20 × 36/30

x = 18 hours