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Average gas mileage

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In a family there are two cars. The sum of the average miles per gallon obtained by the two cars in a particular week is 50 . The first car has consumed 30 gallons during that week, and the second has consumed 25 gallons, for a total of 1350 miles driven by the two cars combined. What was the average gas mileage obtained by each of the two cars in that week?

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This provides an example of determining average gas mileage for two cars.

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