The average mpg would be the total miles driven divided by the total gallons of fuels consumed.
Total miles = 10 + 50 = 60
Total fuel consumption = 10/25 + 50/40 gallons
= 33/20 gallons.
Average mpg = 60/(33/20) = 36.36 = 36 approx.
How did you get 30? Maybe you did a procedural mistake.
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GMAT Prep - Rates-MPG
Source: Beat The GMAT — Problem Solving |
on city no of gallons used = 10/25 = 2/5
on highway no of gallons used = 50/40 = 5/4
Total avg = total distance/total gallons
=60(/(2/5) +(5/4))
= approx. 36
on highway no of gallons used = 50/40 = 5/4
Total avg = total distance/total gallons
=60(/(2/5) +(5/4))
= approx. 36
