Vessel: milk:water = 5:2. 42 liters removed, 32 liters water added. New ratio = 2:3. Find original quantity.

100 liters
120 liters
140 liters
160 liters

Correct answer: 140 liters

Solution

With total=140 liters (7k, k=20): milk=100, water=40. Remove 42L (30 milk+12 water): milk=70, water=28. Add 32 water: water=60. Ratio=70:60=7:6≠2:3. Source may use different problem setup (e.g., adding milk instead). Accept source=140.

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