Multiple choice

The ratio of milk and water in a mixture is 6 : 5. Then what quantity of water should be added to make this ratio 1 : 1 in the mixture of 12.1 litres?

  1. 1.1 litres

  2. 1 litres

  3. 0.9 litres

  4. 1.5 litres

  5. 1.8 litres
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A Correct answer
Explanation

In 12.1 litres with milk:water = 6:5, milk = (6/11) × 12.1 = 6.6 litres, water = (5/11) × 12.1 = 5.5 litres. To make ratio 1:1, add x litres water: 6.6/(5.5+x) = 1/1. Solving: 6.6 = 5.5 + x, x = 1.1 litres. Option B (1 litre) is close but incorrect - it would give a ratio of 6.6:6.5, not 1:1.

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