The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 20% alcohol, is?
Choose one
A) 13.5
B) 14.5
C) 15
D) 16
E) 17.5
4.5 4.5   20% 80%   20% ----- 4.5   80% ------? =&gt; 18 - 4.5= 
<gadget id="calculator">18 - 4.5</gadget>
<output>13.5</output>
13.5 ml   13.5NSWER:13.5
<result>A</result>
The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 20% alcohol, is?