from a container having pure milk 20 is replaced by water..., Percentage, General Mathematics

Question:From 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 :

A `40% pure` 
B `50% pure` 
C `51.2% pure` 
D `58.8% pure`

/114

+ AnswerC

+ ExplanationLet 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%`

+ Report

Descriptive on Percentage Ebook

Total Preview: 653