Eric's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Eric $4.15 per pound, and type B coffee costs $5.75...

Eric's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Eric $4.15 per pound, and type B coffee costs $5.75 per pound. This month's blend used twice as many pounds of type B coffee as type A, for a total cost of $469.50. How many pounds of type A coffee were used?

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Number of pounds of type A coffee-