Question

a sign in an elevator says elevator can lift 450 kg. John has 10 boxes that weigh 13.75kg, and a number of additional boxes that weigh 15.5 kg each. If he puts 10 boxes in elevator, how many additional boxes can be lifted in the same load?

Answer 1

20 boxes

Explanation:

10 boxes are 137.5kg

=> the number of boxes can add :

(450-137.5)/15.5 = 20 (boxes)