Solution A is 20 percent liquid K and 80 percent water and solution B is 10 percent liquid K and 90 percent water. If 2 gallons of solution A and 3 gallaons of solution B are porued into the same container, how many gallons of liquid K should be added into the container to obtain a solution that is 50 percent liquid K and 50 percent water?
A. 1.2
B. 2.4
C. 3.6
D. 4.8
E. 6.0
Ans: C
How to cope with this problem? Please help~ :P