What quantity of water must be added to a 9l sol of 50 % milk to make it 30 % milk?

Options
- 4L
- 5L
- 6L
- 3L

CORRECT ANSWER : 6L

Discussion Board
Solution

Short method
A 9L solution of 50% milk contains 4.5L milk and 4.5L water.
Make 4.5L milk to 30% to get total solution volume

i.e V * 30/100 = 4.5L
V = 450/30 = 15L is the total volume of solution
Here we are adding only water
i.e., 15L - 9L = 6L of water have to be added

Ganesh Banoth 09-3-2021 04:13 PM

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