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There is 80 kg pure milk in a container. You take out 8kg milk and pour in water in its place. You did this process three times in all . How much milk is left in the container now (in kg)?

 Jun 26, 2020
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80 kg - 8kg = 72 kg

now it is   72/80 milk = .9      or 90 percent milk

 

Now remove 8 kg of the mixture (assuming water and milk have the same density)

.9 * 8 = 7.2 kg of milk removed      now it is   (80-8-7.2)/80 = 64.8/80 = 81 % milk

 

remove 8 kg once more (and again replace with water)

.81(8) = 6.48 kg of milk removed

     now it is     (80 - 8 -7.2 -6.48) kg of milk = 58.32 kg of milk

 Jun 26, 2020

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