Multiple choice

A container has 30 litre of water. If 3 litre of water is replaced by 3 litre of sprit and this operation is repeated once more, what will be the quantity of water in the new mixture?

  1. 27.1

  2. 25.5

  3. 14.4

  4. 24.3

  5. 22
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Each replacement operation removes 3 liters from 30, which is 10%. After first operation: water = 30 × 0.9 = 27 liters. After second operation: water = 27 × 0.9 = 24.3 liters. Each operation preserves 90% of the water remaining. Sprit quantity = 30 - 24.3 = 5.7 liters.

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