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18 September, 20:37

On two tests so far this year, a student received a 78 and a 93. The student wants an average between 80 and 90 inclusive. What are all of the possible scores for the third test so that the student falls within this average?

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  1. 18 September, 21:01
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    240 < = 171 + x < = 270

    and now subtract 171 from all and get

    69 < = x < = 99

    So any score from 69 to 99 will do.
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