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Today, 00:26

Rafael Drive 405 miles using 20 gallons of gas. At that rate, how many gallons of gas would he need to drive 243 miles?

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  1. Today, 00:30
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    This is how I'd set it up:

    405/20 = 243/x

    this means the mpg (miles / gallons) for 1 situation is the same as the mpg for the other situation (because the rate is the same)

    then just cross multiply and solve:

    405x=243*20 or 405x=4860 or x = 12

    he would need 12 gallons of gas for 243 miles
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