The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 25% alcohol, is?
Answers.
A) 3
B) 4
C) 5
D) 6
E) 9
4.5 4.5   25% 75%   25% ----- 4.5   75% ------? =&gt; 13.5 - 4.5= 
<gadget id="calculator">13.5 - 4.5</gadget>
<output>9</output>
9 ml   ANSW9R:9
<result>E</result>
The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 25% alcohol, is?