A grocer has two kinds of chocolate. The first kind sells at 4.20 a lb, the second kind at 3.70 a lb. How much should he use of each kind to get 50 pounds of a mixture that he could sell at $4 a lb.?

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let x = first type of chocolate let y = second type of chocolate x + y = 50 4.2x + 3.7y = 4(x + y) Solve the system of equations