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23 April, 04:35

Gary earned an average score of 77 on his first five quizzes. What score will he need on his next quiz to have an overall average of 79

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  1. 23 April, 05:13
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    The next score he needs to have an overall average of 79 is 89.

    Step-by-step explanation:

    Gary earned an average score of 77 on his 5 quizzes. The number of score he needs to have an average of 79 can be calculated below.

    average score = 77

    number of quizzes = 5

    sum of Garry score = a

    a/5 = 77

    cross multiply

    a = 77 * 5

    a = 385

    let

    the next score he needs be b to score an average of 79

    average = 79

    number of quizzes = 6

    385 + b/6 = 79

    cross multiply

    385 + b = 474

    b = 474 - 385

    b = 89

    The next score he needs to have an overall average of 79 is 89.
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