Question

in a mixture of 20 litres,the pure milk is 60%,what quantity of water should be added so that pure milk becomes 40%?​

Answer 1

4 litres

Explanation:

First, we are going to find 60% of 20 litres.

20 ×
`(60)/(100)` = 12 litres

∴ Pure milk 12 litres.

Now we find 40% of 20 litres.

20 ×
`(40)/(100)` = 8 litres

To find the quantity of water to be added we subtract the 8 litres from the 12 litres.

12 - 8 = 4 litres

∴ 4 litres of water should be added so that pure milk becomes 40%