The dietitian wants to plan the meal around 3 foods. The meal is to include 7,200 units of vitamin A, 2,700 units of vitamin C, and 900 units of calcium. Number of units of vitamins and calcium in each ounce of foods is summarized in given table.
Food I Food II Food III
Vitamin A 400 1200 800
Vitamin C 110 thinsp 570 thinsp 340
Calcium 90 thinsp 30 thinsp 60
Find amount of each food dietitian must include in meal to meet vitamin and calcium needs. (Let x, y, and z denote number of ounces of Food I, Food II, and Food III, respectively.