Mathematics, 17.01.2021 19:50 Tyrant4life

In 1990 it would have cost $3.70 to send 13 postcards and 7 letters. It would have cost $2.65 to send 6 postcards and 7 letters. How much did it cost to send a letter in 1990?

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In 1990 it would have cost $3.70 to send 13 postcards and 7 letters. It would have cost $2.65 to se...

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