H D5 M Q21 – Selective High School

John has 50 stamps, some worth 15¢ and some worth 20¢.

If their value is $9.50, how many of each kind does John have?

thirty 15¢ stamps and twenty 20¢ forty 15¢ stamps and ten 20¢ ten 15¢ stamps and forty 20¢ twenty 15¢ stamps and thirty 20¢ fifteen 15¢ stamps and thirty-five 20¢

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If their value is $9.50, how many of each kind does John have?