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 from the following.
A) 8 ml B) 5 ml C) 4 ml D) 6 ml E) 1 ml
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 ml
<result>D</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?