Question

To clean a concrete driveway, a contractor needs a solution that is 30% acid. How Many ounces of a 50% acid solution must be mixed with 15 oz of a 21% solution to obtain a 30% acid solution

Answer 1

My teacher is using a box-thing to help solve these. And, I have no idea how to set up the box or even really what to do with these problems.

Answer 2

can you describe what the box thing looks like ?

Answer 3

This is an example from another problem