Multiple choice

From 200 litres of 80% concentrated milk, 30 litres is taken out and water is added. The new concentration of milk in the mixture is

  1. 60%

  2. 68%

  3. 70%

  4. 172%

  5. 175%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial milk = 0.8 * 200 = 160. Remove 30 liters of mixture (which contains 30 * 0.8 = 24 liters of milk). Remaining milk = 160 - 24 = 136. Total volume remains 200. New concentration = 136 / 200 = 68%.

AI explanation

The initial mixture contains 80% of 200 litres, which is 160 litres of milk. When 30 litres are removed, 24 litres of milk leave the mixture, leaving 136 litres of milk. After 30 litres of water are added, the total volume returns to 200 litres. The new concentration is (136 / 200) times 100, which equals 68%.

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