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)?
+36916 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
