A certain quantity of 45% concentration solution is replaced with 20% concentration solution such that the concentration of the combined amount is 35%.
What's the ratio of the amount of solution that was replaced to the amount of solution that was not replaced? Choose the correct choice from the following answers
A) 1:3  B) 1:2  C) 2:3  D) 2:1  E) 3:1
20% - - - - - - - - - 35% - - - - - - 45%   From 20 to 35 =15   From 35 to 45 = 10   So the ratio is 15/10 = 3 to 2   2:3 it is
<result>C</result>
A certain quantity of 45% concentration solution is replaced with 20% concentration solution such that the concentration of the combined amount is 35%.
What's the ratio of the amount of solution that was replaced to the amount of solution that was not replaced?