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Mathematics, 19.12.2019 23:31 jasonkindred21
Mary needs to send out some letters and postcards. she went online at the united states postal service webpage and found out that it cost 45 cents to mail a letter and 35 cents to mail a postcard. mary wrote to 15 people and the cost of postage was $6.15. if it cost 35 cents to mail a postcard and 49 cents to mail a letter, how many letters and how many postcards did he send?
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