What quantity of water should taken out to concentrate 18 liters of 40% acidic liquid to 60% acidic liquid?	Pick one:	A) 5liters	B) 10liters	C) 15liters	D) 8liters	E) 6liters
Required answer is = 18(60-40)/60 = 6 liters   Answer is 6liters
<result>E</result>
What quantity of water should taken out to concentrate 18 liters of 40% acidic liquid to 60% acidic liquid?