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In a 72-litre drum, milk and water are mixed in the ratio 5 : 1. How many litres of water must be added to bring the ratio to 4 : 1?

Competition practiceRatio, Proportion & Mixtures
  • A3
  • B6
  • C12
  • D2.4

Step-by-Step Solution

Milk = 60 L, water = 12 L. For 4 : 1 with 60 L of milk, water must be 15 L, so add 15 − 12 = 3 L.
Answer: A) 3

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