I know the answer to this but I have to make it into a linear equation and that I do not know how to do.
"Suppose two acid solutions are mixed. One is 26% acid and the other is 34% acid. Which one of the following concentrations cannot possibly be the concentration of the mixture? A: 36% B: 28% C: 30% D:31%"
Now I know the answer is A because you cannot have the mixture higher than the highest or lower than the lowest.
Where do I start?