mathematics

After his first six biology tests, Ruben has a mean score of 78.What score does Ruben need on the next test to raise his average (mean) to 80?

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  1. 7 * 80 = 560
    He needs a total of 560.
    6 * 78 = 468
    He has a total of 468.
    560 - 468 = ______ score he needs on next test.

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    Ms. Sue

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