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27 January, 00:05

The average of your first 6 tests is 82. If your test average after your seventh test is an 80.5, what did you score on the seventh test?

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  1. 27 January, 02:22
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    So average is of the first 6 tests is 82 well that means

    (test1 + test2 + test3 + test4 + test5+test6) / 6 = 82

    so now let do some cross multiplliying

    test1 + test2 + test3 + test 4 + test5 + test6 = 82*6

    test1 + test2 + test3 + test 4 + test5 + test6 = 492

    now lets see if we can find that 7th test score

    (test1 + test2 + test3 + test4 + test5 + test6 + test7) / 7 = 80.5

    So look we found test1 + test2 + test3 + test4 + test5 + test6 to be 492 so lets substitute.

    (492 + test7) / 7 = 80.5

    test7 = (80.5*7) - 492 = 71.5
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