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Math Help - Amount/cost word problem

  1. #1
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    Amount/cost word problem

    All paperback books cost d dollars each and all hardback books cost 2d dollars each. If Kate paid 7d dollars for 5 books, how many paperback books did she buy?

    I'm having trouble setting up an equation to solve this. I know the answer should be 3.
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  2. #2
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    Re: Amount/cost word problem

    let x = number of paperbacks purchased

    dx + 2d(5-x) = 7d

    x + 2(5-x) = 7

    solve for x
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  3. #3
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    Re: Amount/cost word problem

    Thanks skeeter! Makes so much more sense now!
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