Mathematics, 09.10.2019 19:00 giulianna41

Abc bookstore sells new books, n, for $12, and used books, u, for $8. the store earned $112 revenue last month. the store sold 4 more used books than new books. using the substitution method, how many new and old books did abc bookstore sell?

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Abc bookstore sells new books, n, for $12, and used books, u, for $8. the store earned $112 revenue...

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