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Suppose a man needs a minimum of 50 units of carbohydrates, 40 units of proteins per month for a good health. He is taking food at two places. viz. A and B . Food at A contains 4 and 5 units of carbohydrates and proteins respectively. Food at B contains 1 and 3 units of carbohydrates ans proteins respectively. Express this in the form of linear inequalities assuming that the man is keeping good health.