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27 September, 09:46

Dave has $15 to spend on an $8 book and two birthday cards (c) for his friends. how much can he spend on each card if he buys the same card for each friend?

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  1. 27 September, 09:55
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    Funds = Expenses

    Funds is $15, Expenses are the book and the two cards. We know how much the book costs ($8). We do not know how much each card costs, so we'll call that "x".

    $15 = $8 + 2x

    Subtract $8 from both sides of equation: $15 - $8 = $8 - $8 + 2x

    Simplify: $7 = 2x

    Divide both sides of the equation by 2: $7/2 = 2x/2

    Simplify: $3.50 = x

    So, each card costs $3.50
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