# Practice GMAT Problem Solving Question

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Solution x contains 75% water and 25% oil; how many more liters of water than liters of oil are in 200 liters of solution x?

Correct Answer:

**E**- In order to find out "how many more liters of water than liters of oil are in 200 liters of solution x", we must first find out the quantity of each component in 200 liters.
- For water, 75% of 200 liters is 150 liters of water:

(200 liters)(0.75 water concentration) = 150 liters of water - For oil, 25% of 200 liters is 50 liters of oil:

(200 liters)(0.25 oil concentration) = 50 liters of oil - The difference between the two is 150-50, which equals 100 liters. Thus, 200 liters of solution x contains 100 liters more water than it does oil. The correct answer is E.

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