I've discovered the true purpose of alligation.
This is a method for solving solution problems. Here's an example:
How many mL of water must be added to 300 mL of 70% alcohol solution to make a 40% alcohol solution?
So what is the true purpose of learning alligation?
So you can help your kids when they have to do the same questions when they take Algebra. That's it. That's the ONLY reason.