Form a container having pure milk,20% is replaced by water and the process is repeated thrice . At the end of the
third operation, the milk is :
Let total quantity of original milk = 1000 gm.
Milk after first operation = 80% of 1000 = 800 gm
Milk after second operation = 80% of 800 = 640 gm.
Milk after third operation = 80% of 640 = 512 gm
`:.` Strength of final mixture = 51.2 %
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