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16 December, 20:26

The first car has a fuel efficiency of 15 miles per gallon of gas and the second has a fuel efficiency of 40 miles per gallon of gas. during one particular week, the two cars went a combined total of 1450 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?

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  1. 16 December, 20:27
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    1st car = x

    2nd car = y

    x + y = 55 gallons rewrite as x=55-y

    15x + 40y = 1450 miles

    15 (55-y) + 40y=1450

    825-15y + 40y=1450

    825+25y=1450

    25y=625

    y = 25

    x = 55-25=30

    1st car used 30 gallons and 2nd car used 25 gallons
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