Question 435835
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Hi
Let x represent gallons of gasoline needed to travel 500 miles
Question Sets Up the Proportion***
 {{{12/150 = x/500}}}   | Cross Multiplying 
    150x = 12*500
       x = 12*500/150
       x = 40gal,  gallons of gasoline needed to travel 500 miles 

CHECKING our Answer***
 12/150 = 40/500 = 2/25