Multiple choice

A container contains 80 litres of milk. 8 litres of milk was taken out and replaced by water. This process is repeated two more times. Find how much milk is now left?

  1. $58.42 litres$
  2. $48.32 litres$
  3. $58.32 litres$
  4. $59.32 litres$
  5. $None of these$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Each operation removes 8/80 = 1/10 of the milk and replaces it with water. After 3 operations: milk remaining = 80 × (0.9)^3 = 80 × 0.729 = 58.32 litres. This is a standard dilution problem using the concept of successive percentage decrease.

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