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Directions (Q91–95): Food X contains 6 units of vitamin D per gram and 7 units of vitamin E per gram and costs Rs 12 per gram. Food Y contains 8 units of vitamin D per gram and 12 units of vitamin E per gram and costs Rs 20 per gram. The daily minimum requirements of vitamin D and E are 100 units and 120 units respectively. Let x be the quantity (in grams) of food X and y the quantity (in grams) of food Y.

The cost function of the total food is:

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Correct answer: C. Z = 12x + 20y

Explanation

Cost = 12 per gram of X + 20 per gram of Y: Z = 12x + 20y.

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