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10 July, 01:48

The problem is how many people must attend the third show so that the average attendance for three shows is 3000? And the other show attendance numbers are 2580, and 2920

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  1. 10 July, 02:11
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    An average is just the total attendance numbers / the number of performances.

    Let's let the number of people in the third show be equal to x so we can write this as a formula, it's easier to read. x is just "some number we don't know"

    The average is

    Average=Total attendance/3

    So

    3000 = (2580+2920+x) / 3

    So let's multiply by that 3 on both sides, make x easier to find

    Average*3=2580+2920+x ( * means multiplied)

    The average is 3000

    So

    2580+2920+x=3000*3

    2580+2920+x=9000

    Then we subtract those other attendances to get x on its own.

    x=9000-2580-2920

    x=3500
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