algebra

An elevator when full holds 20 kids or 15 adults. If 12 kids are on the elevator how many adults can still get on. I need to use an algebraic equation/expression to solve this word problem..I need step by step solutions to explain it...Thank you...

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  1. Set up a proportion
    20 kids/15 adults = 12 kids/X adults
    cross multiply
    X=9

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  2. Thank you...I received several different ways to answer this problem with different answers......

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