SOLUTION: A car gets 28 mpg on highway, 22 mpg in city...total trip is 627 miles using 24 gallons of gas how many miles were driven in city?

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Let x = Number of miles driven in the city
627 - x = Number of miles driven on highway

The basic formula here is
Gallons in city + gallons on highway = Total gallons


Multiply both sides of the equation by the product of the two denominators:




Miles in city
Miles on highway

Total gas used:
gallons
gallons
gallons total

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