The weight of a bag of golf balls varies directly as the number of golf balls in the bag. If a bag of 69 golf balls weighs 2,553 grams, how many golf balls are in a bag that weighs 1,110 grams?
69 / 2553 = x / 1110
1110 * 69 = 2553 * x
x = 1110 * 69 / 2553 = 30