Jane's Orange-Pineapple Drink (1) 10) After having made 32 ounces of an orange-pineapple drink, in which 15% is pineapple juice, Jane decided to increase the pineapple juice to 25%. To do so, how many ounces of it did she have to pour into the pitcher? 0.15(32) + 1.00(x) = 0.25(32 + x) First, convert the decimal numbers to whole numbers by multiplying by 100: 15(32) + 100(x) = 25(32 + x) x = ounces The "100" represents the 100% (or pure) pineapple juice to be added. 480 + 100x = 800 + 25x 100x = 320 + 25x 75x = 320 x = 4.266 (ounces of pineapple juice to be added) Let's double-check. Before After (new mixture) 15% pineapple juice 25% pineapple juice 85% orange juice 75% orange juice 32 ounces 36.266 ounces 4.8 ounces (pineapple juice) 9.0665 ounces (pineapple juice) 27.2 ounces (32 X 0.75) 27.1995 ounces (orange juice) ----------------------------- ----------------------------- 32.0 ounces 36.2660 ounces