March 30, 2017

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According to a rating agency, a car's MPG (miles per gallon) ratings are: 25 MPG for city and 30 MPG for highway driving. A driver spent $20.00 (the gasoline costs $1.25/gallon) on a combined city and highway trip of 450 miles. How many miles "C" in city and "H" on highway was the car driven ?

I need to get two equations out of this and use the substitution or elimination method to solve this problem.

  • Math - ,

    Let C = 450 - H

    $1.25 (30H + 25C) = $20

    Substitute the value of C in the first equation into the second. Solve for H. Put value of H into the first equation to solve for C. Check by putting both values into the second equation.

    I'll let you do the calculations. I hope this helps. Thanks for asking.

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