GMAT PREP Practice Test 2 PS

Where the other answer choices really far from 36? The actual answer is 36 and change... but if it asks for the "closest" answer, and there is no answer closer to 36, I suppose 36 would suffice.

Here's how to do it:

The car averages 25 miles per gallon while in the city and it drives 10 miles in the city. Therefore, the total gas consumed in the city is 10/25 gallons.

The car averages 40 miles per gallon while on the highway and it drives 50 miles on the highway. Therefore, the total gas consumed on the highway is 50/40 gallons.

The total milage driven is 10 + 50 = 60 miles.
The total gas used is 10/25 + 50/40 = 33/20 gallons.

Approximate milage per gallon is calculated: 60/(33/20) = 1200/33 =~ 12/(1/3) = 36.

1. 28
2. 30
3. 33
4. 36 (Answer)
5. 38

Thank you so much for your help!