hard · GMAT Quant
A tank contains 50 liters of a mixture of milk and water in the ratio 7:3. Some of this mixture is drained off and replaced with an equal volume of pure water. After this replacement, the ratio of milk to water in the tank becomes 21:29.
How many liters of the original mixture were drained off?
- 15
- 25
- 10
- 30
- 20
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