What quantity of water should taken out to concentrate 27 liters of 40% acidic liquid to 60% acidic liquid?	Select.
A) 5liters	B) 10liters	C) 15liters	D) 9liters	E) 6liters
Required answer is = 27(60-40)/60 = 9 liters   Answer is 9liters
<result>D</result>
What quantity of water should taken out to concentrate 27 liters of 40% acidic liquid to 60% acidic liquid?