math

A family had two cars. The first car fuel efficiency of 20 miles per gallon of gas and the second car has a fuel efficiency of 40 miles per gallon of gas. During one particular week the two cars went a combined Total of 1100 miles for a total gas consumption of 40 gallons how many gallons were consumed by each of the two cars that week?

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  1. Distance = (number of gallons)(rate in mpg)

    let the number of gallons used by the gas-guzzler be x
    then the number gallons used by the nice car = 40-x
    20x + 40(40-x) = 1200

    solve for x

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    Reiny

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