Question

Siobhan is preparing for her beach party in January. She needs to buy 120 cubic feet of sand to cover her garage floor. Sand comes in bags of 10 cubic feet. Each bag of sand costs $7.50, including tax. How much money does Siobhan need to turn her garage into a beach?

Answer 1

The answer is $90

(1) Calculate the number of bags needed:
1 bag : 10 ft³ = x bags : 120 ft³
x bags = 1 bag * 120 ft³ : 10 ft³
x = 12 bags

(2) Calculate the price for 12 bags:
1 bag : $7.50 = 12 bags : $x
x = $7.50 * 12 bags : 1 bag
x = $90