Multiple choice

The ratio of milk and water in 55 litres of adulterated milk is 7:4. How much water must be added to make the mixture's ratio 7 : 6?

  1. 5 litre

  2. 10 litere

  3. 15 litere

  4. 25 litere

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In 55 litres with ratio 7:4, milk = 7/11 x 55 = 35L, water = 4/11 x 55 = 20L. Let x be water added. New ratio 7:6 means 35/(20+x) = 7/6, solving gives 210 = 140 + 7x, so 7x = 70 and x = 10L. Option B is correct despite the typo 'litere'.

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