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23 February, 17:19

your test grades are 85,74, and 91. What is the lowest grade you can get on the next test and have an average of at least 80

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  1. 23 February, 17:34
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    Lowest grade is 70.

    Step-by-step explanation:

    To have an average of 80 the total score is 4 * 80 = 320.

    So the score for the next test must be 320 - (85 + 74 + 91)

    = 70.
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