<PRE><B>Question 818373</B>
 A car manufacturer produces three models in equal quantities. 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 economy rating is required for the third model?
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Let the 3rd model rating be &quot;x&quot;:
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Equation:
(17 + 19 + x)/3 = 21
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36 + x = 3*21
x = 63-36
x = 27 mph
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Cheers,
Stan H.
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