SOLUTION: I want to make 50 liters of a 60% solution, but I only have a 70% solution and a 20% solution on my shelf. How much of each solution should I use?

You can put this solution on YOUR website!
If you'll use x liters of a 70% solution, then for make 50 liters of solution you have to add (50-x) liters of a 20% solution.
In x liters 70% solution is 0.7x liters substance, in (50-x) liters 20 % solution is substance, we will make 50 liters 60% solution, so will have liters of substance
Equation




liters of a 70% solution, and (50-40)=10 liters of a 20% solution