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c. approx 18 gal
d. approx 25 mpg
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sqdancefan
You work these problems the same way parts A and B were worked.

C) cost of gas = (cost per gallon)*(number of gallons)
.. 71.98 = 3.999*(number of gallons)
.. 71.98/3.999 = number of gallons = 18

D) miles per gallon = miles/gallons
.. miles per gallon = (15121 -15004)/(.25*18) = 117/4.5
.. miles per gallon = 26

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