John's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs John $4.35 per pound, and type B

Question

John's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs John $4.35 per pound, and type B coffee costs $5.40 per pound. This month, John made 139 pounds of the blend, for a total cost of $662.40. How many pounds of type B coffee did he use?

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