AI Doubt Solver

In a mixture of milk and water in ratio 5:2, how much water to add to make it 5:3?

Let milk = 5x, water = 2x. Water to add = y. New ratio: 5x:(2x+y)=5:3 ⇒ 15x = 10x + 5y ⇒ y = x. If total was 7 litres, add 1 litre water.

How do I approach a para-jumble with 5 sentences when 2 seem interchangeable?