Question: how many liters of water will have to be added to 1125 liters?
Answer: Given is 1125 of 45% solution of acid. So, it has 45% acid which is 506.25 liters of acid (618.75 liters of acid). When we add water, acid contents remains the same. To achieve more than 25% concentration, 506.25 should be atleast 25% of total solution.