SOLUTION: A car manufacturer produces three models in equal quanties. One model has an economy rating of 17 miles per gallon and the second model is rated for 19 mpg. If government regulat

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Question 221196: A car manufacturer produces three models in equal quanties. One model has an economy rating of 17 miles per gallon and the second model is rated for 19 mpg. If government regulations require the manufacturer to have a fleet average that exceeds 21 mpg, what ecomony rating is required for the third model?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = economy rating of 3rd model
%2817+%2B+19+%2B+x%29%2F3+=+21
17+%2B+19+%2B+x+=+63
x+=+63+-+36
x+=+27
The economy rating of the 3rd model must be
greater than 27 mpg