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26 February, 03:33

Mr. Harper's car used 5 gallons of gasoline to travel 150 miles. After he had some work done on the cars engine, it used it used 6 gallons of gasoline to travel 210 miles. If the price of gasoline was $3.50 per gallon, how much money did Mr. Harper save per mile after the work was done on the cars engine? (Round your answers to the nearest cent.)

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  1. 26 February, 05:30
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    He saves $0.0175 per mile

    Step-by-step explanation:

    Before the work done on the car's engine, it took 0.033 gallons to travel one mile (5 gallons / 150miles = 0.033). After this work, the car spends 0.028 gallons to travel one mile (6 gallons/210 miles = 0.028). The difference between this two is:

    0.033 gallons/mile-0.028 gallons/mile = 0.005 gallons per mile.

    Now Mr. Harper's saves 0.005 gallons per mile.

    In money he saves:

    $3,50/gallon*0.005 gallon/mile = $0.0175/mile (the unit of "gallon" cancel each other)

    Rounded to the nearest cent:

    He saves $0.0 per mile.
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