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Get access to the detailed solutions to the previous years questions asked in IIM IPMAT exam
Let's start from the step when there was 50% concentration.
Let's take there to ee 2T solution: T acid and T water.
Adding 15 litres of acid increases the acid concentration to 80%, giving the equation 
Solving this would give us T = 5
This means that there were 5 litres of acid and 5 litres of water after mixing 2 litres of water.
Therefore, there would be 5 litres of acid and 3 litres of water before adding the water.
We are asked the ratio of water to acid, which would be 3 : 5