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?
Choose the correct choice: A) 2 B) 5 C) 6 D) 9 E) 4
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   Answer:6
<result>C</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?