Mathematics
Mathematics, 18.12.2020 02:40, junior2461

At a book sale, all paperback books cost d dollars each and all hard books cost 2d dollars each. If Kate paid 7d dollars for 5 books at this sale, how many paperback books did she buy?

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At a book sale, all paperback books cost d dollars each and all hard books cost 2d dollars each. If...

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