Multiple choice

A container contains 90 kg of milk,from this container 9 kg of milk was taken out and replaced by water, this process was further performed two times. How much milk is now there in the container ?

  1. 70 kg.

  2. 71 kg.

  3. 73 kg.

  4. 74 kg.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using successive dilution formula: Milk remaining = 90 × (1 - 9/90)^3 = 90 × (0.9)^3 = 90 × 0.729 = 72.9 kg. Rounding gives 73 kg. The process is done once and then 'further performed two times', total 3 times.

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