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18 May, 12:19

Mudrik installed a device on his car that guaranteed to increase his gas mileage by 10%. The gas mileage increased by 3 miles per gallon after installing the device. How many miles per gallon did he get before the device was installed?

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  1. 18 May, 13:32
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    Let x = gas mileage before installing the device.

    Because the gas mileage increased by 10% which is equal to 3 miles per gallon, therefore

    0.1x = 3

    x = 3/0.1 = 30 mi/gal

    Answer: 30 miles per gallon
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