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Last Updated on May 4, 2023
GMAT OFFICIAL GUIDE PS
Solution:
To solve this problem we will need to use the formula: rate x gallons = distance, which means:
gallons = distance/rate
We need to calculate the number of gallons used by car X and the number of gallons used by car Y. Let’s start with car X.
For car X we know the following:
rate = 25
distance = 12,000
gallons = 12,000/25 = 480 gallons
For car Y we know the following:
rate = 11.9
Since we are told we can approximate, we can round up the rate of Car Y to 12.
distance = 12,000
gallons = 12,000/12 = 1,000
Thus, we can say that car Y will use approximately 1,000 – 480 = 520 more gallons of gasoline than car X.
