HSC Science (Computer Science) 12th Board ExamMaharashtra State Board
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Solution - A Diet of a Sick Person Must Contain at Least 48 Units of Vitamin a and 64 Units of Vitamin B. Two Foods F 1 and F2 Are Available. Food F1 Costs Rs. 6 per Unit and Food F2 Costs Rs. 10 per Unit. One Unit of Food F1 Contains 6 Units of Vitamin a and 7 Units of Vitamin B. - HSC Science (Computer Science) 12th Board Exam - Mathematics and Statistics

Question

A diet of a sick person must contain at least 48 units of vitamin A and 64 units of vitamin B. Two foods F 1 and F2 are available. Food F1 costs Rs. 6 per unit and food F2 costs Rs. 10 per unit. One unit of food F1 contains 6 units of vitamin A and 7 units of vitamin B. One unit of food F2 contains 8 units of vitamin A and 12 units of vitamin B.Find the minimum cost for the diet that consists of mixture of these two foods and also meeting the minimal nutritional requirements.

Solution

Let x and y be two different types of food.
Thus, our objective function is minimise the cost
Z = 6x + 10y, subject to the constraints,
6x + 8y ≥48
7x + 12y ≥ 64
Plotting the above lines in a graph, we have,

Thus, the region above ABC is unbounded.
Let us check the value of the function at the corner points A, B and C

Corner point Value of Z = 6x + 10y
(0,6) Z = 0 + 10 x 6 = 60
(4,3) Z = 6 x 4 + 10 x 3 = 54
(64/7,0) Z = 6 x 64/7+ 10 x 0 = 54.85

Minimum of the function is at 4, 3
Minimum cost of the optimum diet is Rs. 54

 

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 2014-2015 (March) (with solutions)
Question 3.2.3 | 4 marks

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Reference Material

Solution for question: A Diet of a Sick Person Must Contain at Least 48 Units of Vitamin a and 64 Units of Vitamin B. Two Foods F 1 and F2 Are Available. Food F1 Costs Rs. 6 per Unit and Food F2 Costs Rs. 10 per Unit. One Unit of Food F1 Contains 6 Units of Vitamin a and 7 Units of Vitamin B. concept: null - Different Types of Linear Programming Problems. For the courses HSC Science (Computer Science), HSC Science (General) , HSC Arts, HSC Science (Electronics)
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