A certain quantity of 65% concentration solution is replaced with 25% 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:  A) 1:3  B) 1:2  C) 2:3  D) 2:1  E) 3:1
25% - - - - - - - - - 35% - - - - - - 65%   From 25 to 35 =10   From 35 to 65 = 30   So the ratio is 10/30 = 1 to 3   3:1 it is
<result>E</result>
A certain quantity of 65% concentration solution is replaced with 25% 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?