What quantity of water should be added to reduce 9 liters of 50% acidic liquid to 30% acidic liquid? Choices:
A) 6liters  B) 8liters  C) 10liters  D) 12liters  E) 15liters
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+3x = 45   x = 6liters   6litersnswer is 6liters
<result>A</result>
What quantity of water should be added to reduce 9 liters of 50% acidic liquid to 30% acidic liquid?