Question

The ratio of milk and water in a 30 litre mixture is 3:2, how much water should be added to make the ratio 1:1

Answer 1

Let amount of milk be 3x and amount of water be 2x
3x+2x = 30
5x = 30
x = 6 litres.
Present ratio is 3:2
For ratio to be 1:1, again 6 litres of water should be added.
So, 3:2---> 3:3-----> 1:1.