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26 October, 00:26

A family has two cars. The first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. During one particular week, the two cars went a combined total of 950 miles, for a total gas consumption of 50 gallons. How many gallons were consumed by each of the two cars that week?

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  1. 26 October, 00:44
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    25*X + 15*Y = 950

    X + Y = 50

    Y = 50 - X

    25*X + 15 * (50 - X) = 950

    25*X + 750 - 15*X = 950

    10*X = 200

    X = 20

    Y = 50 - 20

    Y = 30
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