The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 45% alcohol, is? Choose one:
A) 1
B) 4
C) 5
D) 6
E) 7
4.5 4.5   45% 55%   45% ----- 4.5   55% ------? =&gt; 5.5 - 4.5= 
<gadget id="calculator">5.5 - 4.5</gadget>
<output>1</output>
1 ml   1NSWER:1
<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 45% alcohol, is?