A drum contains 80 litres of a 90% pure acid solution. If 8 litres of this solution are removed and replaced with 8 litres of pure water, what is the new percentage of acid in the solution?
Show answer & explanation
Correct answer: B
Explanation
Total Solution = 80 liters
Acid Content = 90%
Solution Removed = 8 liters
Added = 8 liters of pure water
Initial Acid Content = 0.90 × 80 = 72 liters
Acid in the 8 liters removed = 0.90 × 8 = 7.2 liters
Remaining Acid = 72 − 7.2 = 64.8 liters
New Percentage