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29 July, 17:30

you have a list of 7 numbers. the average of the numbers is 9. if you take away one of the numbers, the average of the numbers is 8. what number did you take away?

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  1. 29 July, 20:43
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    There was a 15 among the 7 numbers. That is the number you removed.

    Step-by-step explanation:

    x/7 = 9 (1)

    (x - y) / 6 = 8 (2)

    Multiply 1 by 7

    x/7 * 7 = 9*7

    x = 63

    Put 63 for x into equation 2

    (63 - y) / 6 = 8 Multiply by 6

    6 * (63-y) / 6 = 8*6

    63 - y = 48 Add y to both sides

    63-y+y = 48+y

    63 = 48 + y Subtract 48 from both sides

    63-48=48-48+y

    y = 15
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