What quantity of water should be added to reduce 9 liters of 50% acidic liquid to 30% acidic liquid? Select:  A) 6 liters  B) 8 liters  C) 10 liters  D) 12 liters  E) 15 liters

Rationale: acid in 9 liters = 50 % of 9 = 4.5 liters suppose x liters of water be added . then 4.5 liters of acid in 9 + x liters of diluted solution 30 % of 9 + x = 4.5 27 + 3 x = 45 x = 6 liters answer is a
Answer: A