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ATQ,
Milk : Water = 7:5 → Total = 12 parts
Let total = 12x
→ Milk = 7x, Water = 5x
Add 20 litres of water → Water = 5x + 20
→ New ratio = 7x : (5x + 20) = 7 : 6
Original = 12 × 20 = 240 litres
Final = 240 + 20 = 260 litres
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