Multiple choice

A container contains 50 litres of milk. From this container 5 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container?

  1. 28.50

  2. 36.45

  3. 25.5

  4. 32.25
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is a dilution problem. After each replacement, milk reduces by factor (45/50)=0.9. After 3 replacements: 50×(0.9)³ = 50×0.729 = 36.45 litres. Alternatively: 50×(45/50)³ = 50×(9/10)³ = 50×729/1000 = 36.45.

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