The amount of water (in ml) that should be added to reduce 6 ml. Lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is?  Choose the most appropriate option:
A) 8 ml
B) 5 ml
C) 4 ml
D) 6 ml
E) 1 ml
3 3   30% 70%   30% ----- 3   70% ------? =&gt; 7 - 3= 
<gadget id="calculator">7 - 3</gadget>
<output>4</output>
4ml   Answer:4 ml
<result>C</result>
The amount of water (in ml) that should be added to reduce 6 ml. Lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is?