Mathematics, 23.01.2022 01:00, linnlinn2320

One day, a girl bought 20 first-class stamps and 10 postcard stamps for $17.10. Another day she spent $70.70 on 80 first-class stamps and 50 postcard stamps. Find the cost of each type of stamp.

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One day, a girl bought 20 first-class stamps and 10 postcard stamps for $17.10. Another day she spen...