Posted by **Andrea** on Saturday, July 26, 2008 at 12:36pm.

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.

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