The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 15% alcohol, is? Select the correct option: A) 21 B) 24 C) 25 D) 26 E) 27
4.5 4.5   15% 85%   15% ----- 4.5   85% ------? =&gt; 25.5 - 4.5= 
<gadget id="calculator">25.5 - 4.5</gadget>
<output>21</output>
21 ml   21NSWER:21
<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 15% alcohol, is?