SOLUTION: How much 87-octane gas and 93-octane gas should Kelsey mix in order to make 12 gal of 91-octane gas for her Legacy?

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Question 607091: How much 87-octane gas and 93-octane gas should Kelsey mix in order to make 12 gal of 91-octane gas for her Legacy?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(x)(87) + (12 - x)(93) = (12)(91)