Question: Refer to Exercise 43. Show that when the required units of iron are increased to 64 units, there are several combinations of the three foods

Refer to Exercise 43. Show that when the required units of iron are increased to 64 units, there are several combinations of the three foods that meet the requirement. Give two such combinations.
The nutritional content of three foods is given by the accompanying table. Use the methods of this section to show that no combination of these three foods can contain 72 units of B-12, 68 calories, and 60 units of iron.

Food A 3 4 Food B Food C B-12 (units per gram) Calories (per gram) Iron (units per gram) 10 15 12 1 14

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