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A stamp collector bought 160 stamps for $25.00. The purchase included 5 stamps, 15 stamps, and 25 stamps. The number of 15 stamps is three

A stamp collector bought 160 stamps for $25.00. The purchase included 5 stamps, 15 stamps, and 25 stamps. The number of 15 stamps is three times the number of 5 stamps. How many of each type of stamp was purchased?

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