Mathematics
Mathematics, 30.01.2021 01:00, tommyaberman

ABC Bookstore sells one customer 12 used books and 4 new books for $136. Another customer buys 14 used books and 2 new books for $124. How much is one used book (u), and one new book (n)?

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ABC Bookstore sells one customer 12 used books and 4 new books for $136. Another customer buys 14 us...

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