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1 March, 05:44

After five tests, Mike's average score is 91. After 6 tests, his average score was 89. what was his score, on the sixth test?

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  1. 1 March, 06:05
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    (x 1 + x 2 + x 3 + x 4 + x 5) / 5 = 89 Multiply both sides by 5

    x 1 + x 2 + x 3 + x 4 + x 5 = 89 * 5 = 445

    (x 1 + x 2 + x 3 + x 4 + x 5 + x 6) / 6 = 90

    (445 + x 6) / 6 = 90 Multiply both sides by 6

    445 + x 6 = 6 * 90 = 540

    x 6 = 540 - 445 = 95
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