Terrell usually lifts two 20-pound weights 12 times. If he uses two 15-pound weights instead, how many times must Terrell lift them in order to lift the same total weight?
To solve this problem, I need to compare the total weight that Terrell lifts in each scenario. If he lifts two 20-pound weights 12 times, then the total weight is 2 times 20 times 12, which is 480 pounds. If he lifts two 15-pound weights, then the total weight is 2 times 15 times the number of times he lifts them, which I'll call x. I want this total weight to be equal to 480 pounds, so I can set up an equation: 2 times 15 times x equals 480. To solve for x, I can divide both sides by 2 times 15, which is 30. This gives me x equals 480 divided by 30, which is 16. Therefore, Terrell must lift the two 15-pound weights 16 times in order to lift the same total weight as before. 