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23 September, 19:42

A elevator has a capacity of twenty adults or twenty four childern. How many childern can ride with fifteen adults?

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  1. 23 September, 21:06
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    Let adults be x and children be y, then

    20x = 24y

    x = 6/5y

    Let the number of children be a, then

    15x + ay = 24y

    15 (6/5y) + ay = 24y

    18y + ay = 24y

    18 + a = 24

    a = 24 - 18 = 6

    Therefore, 6 children can ride with 15 adults.
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