How many liters of water should be added to 10 liter of a 20% saline (salt) solution to make a 5% saline solution?
At present you have 2 litres of salt in 8 litres of water which is 2/10 = 0.2 = 20% saline
I want to know how much water I need with 2 litres of salt to get 5% salinity
Let the TOTAL amount of solution be x litres
2/x = 0.05
2/0.05 = x
But 2 we already have 10 litres of that so we need to add 30L of water.
2/40 = 0.05 = 5%
You might find that someone can explain this more simply than me.