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5 August, 22:55

The hardcover version of a book weighs 7 ounces while its paperback version weighs 5 ounces. forty-five copies of the book weigh a total of 249 ounces.

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  1. 5 August, 23:08
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    We let x and y be the number of copies in hardcover version and paperback version, respectively. The equations that would best represent the given scenario above are

    x + y = 45

    7x + 5y = 249

    The values of x and y from the system of linear equations are 12 and 33, respectively. Therefore, there are 12 hardcover version and 33 paperback versions.
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