A certain quantity of 45% concentration solution is replaced with 15% 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
15% - - - - - - - - - 35% - - - - - - 45%   From 15 to 35 =20   From 35 to 45 = 10   So the ratio is  20/10= 
<gadget id="calculator"> 20/10</gadget>
<output>2</output>
2 to 1   1:2 it is
<result>B</result>
A certain quantity of 45% concentration solution is replaced with 15% 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?