The amount of water (in ml) that should be added to reduce 21 ml. Lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is? Choose the correct choice:
A) 8 ml
B) 5 ml
C) 14.5 ml
D) 6 ml
E) 1 ml
10.5 10.5   30% 70%   30% ----- 10.5   70% ------? =&gt; 24.5 - 10.5 = 14.5 ml   Answer:14.5 ml
<result>C</result>
The amount of water (in ml) that should be added to reduce 21 ml. Lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is?