SOLUTION: Julio has found that his new car gets 36 miles per gallon on the highway, and 31 miles per gallon in the city. He recently drove 397 miles on 12 gallons of gas. How many highwa mil
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Question 506191: Julio has found that his new car gets 36 miles per gallon on the highway, and 31 miles per gallon in the city. He recently drove 397 miles on 12 gallons of gas. How many highwa miles did he drive? How many city miles did he drive?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Let 
represent the number of miles driven at 36 miles per gallon.
Then 
represents the number of miles driven at 31 miles per gallon.
Then 
is the number of gallons used at 36 mpg and 
is the number of gallons used at 31 mpg. Together these amounts add up to the 12 gallons used.
Solve for . Then calculate
John
My calculator said it, I believe it, that settles it
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