4 liters because 12% of 18 liters is 2.16 and the goal is 3% so 3% of 18 is 0.54 so you do 2.16/0.54 which equals 4 liters of water
Four litres of pure water should be mixed with 18 litres of a 12% saline solution to make a saline solution that is 3% salt.
To find the litres of pure water mixed:
Given:
Pure water is mixed with 18 litres of a 12% saline solution to make a saline solution that is 3% salt.
Amount of pure water mixed =?
Now,
As given in the question, we have
18 litres of 12% saline solution
= 18 × (12/100)
= 2.16 litres
To make a saline solution containing 3% salt
Hence, four litres should be mixed to obtain a saline solution having 3% salt.
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