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15 August, 14:11

A family has two cars. the first car has a fuel efficiency of 20 miles per gallon of gas and the second has a fuel efficiency of 25 miles per gallon of gas. during one particular week, the two cars went a combined total of 775 miles, for a total gas consumption of 35 gallons. how many gallons were consumed by each of the two cars that week?

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  1. 15 August, 14:41
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    Let's call the fuel consumption of the first car "x" and the second car "y"

    x + y = 35 is the total fuel consumed.

    20x + 25y = 775 is the distance traveled.

    Solve the two equations. Skipping a few steps, I get

    5y = 75. Therefore y = 15. So y used 15 gallons of gas. Therefore x used 20 gallons.

    20 gallons, 15 gallons.
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