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Math Help - Algebra word problem

  1. #1
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    Algebra word problem

    Easy word problem: If 6 gallons of premium unleaded gasoline costs $15.54, how much would it cost to completely fill a 15-gallon tank?

    The answer is $38.85. Take the 15.54 divide that by 6, then multiply this by 15. But how do you write this in an algebra problem using x? I don't have a clue. Help!
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  2. #2
    Super Member 11rdc11's Avatar
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    y= \frac{15.54x}{6}

    x is how many gallons you pump
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