A 40 L solution contains salt and water in the ratio 2 : 3. How much water should be added to make the ratio 2 : 5?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 16 L.
total parts = 5
Salt = 2/5 × 40 = 16 L
Water = 3/5 × 40 = 24 L
New ratio required = 2 : 5
Salt stays same = 16 L
So water must become = (5/2) × 16 = 40 L
Current water = 24 L
Water to add = 40 − 24 = 16 L