We want to create 50 liters of 45% concentrated acid. We have two solutions - one is 30% acid and the other is 60% acid. How much of each is needed to create our desired solution?
25 litres of each of the 30% and 60% solutions will produce the required 50 litres of 45% acid
We have the following situation:
From this chart, we can see two things:
To solve, I'm going to take the first equation and solve for
and now substitute it into the second equation:
which means that: