The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is?  Pick one:
A) 5  B) 2  C) 3  D) 4  E) 6
4.5 4.5   30% 70%   30% ----- 4.5   70% ------? =&gt; 10.5 - 4.5= 
<gadget id="calculator">10.5 - 4.5</gadget>
<output>6</output>
6 ml   ANSW6R 6
<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 30% alcohol, is?