Source: Official Guide for GMAT Review 2016 Problem Solving; #50

3

Car X averages 25.0 miles per gallon

Car X averages 25.0 miles per gallon of gasoline and Car Y averages 11.9 miles per gallon. If each car is driven 12,000 miles, approximately how many more gallons of gasoline will Car Y use than Car X?

2 Explanations

1

NIKHIL BORKER

Another approach could be

X would need 1/25 gallons to cover every mile and Y would need 1/11.9~=1/12 gallons to cover every mile

After 1 mile, Y would need approx 1/12-1/25 gallons more than X

1/12-1/25 conveniently simplifies to 13/300.

If after covering 1 mile, the difference between the gas consumption of Y and X is 13/300, then after 12000 miles, it will be 12000*13/300=40*13=520

Jan 23, 2016 • Comment

Cydney Seigerman, Magoosh Tutor

Thanks for sharing your alternative solution!

Jan 26, 2016 • Reply

1

Gravatar Mike McGarry, Magoosh Tutor

Aug 13, 2015 • Comment

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