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Vessel: 2.5L water + 10L milk. 20% removed. x liters water added to reverse milk:water ratio. Then y liters milk added to re-reverse. Find y.

1. 100
2. 110
3. 120
4. 130

Correct answer: 120

Solution

Initial: milk=10L, water=2.5L. 20% removed: remaining=80%: milk=8L, water=2L. Ratio still 4:1. Add x water to reverse (ratio 1:4): 8/(2+x)=1/4 → 2+x=32 → x=30. Now: milk=8, water=32. Add y milk to reverse again (ratio=4:1): (8+y)/32=4 → 8+y=128 → y=120. ✓

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