Word Problem chapter 10 medium question type #10

[yeahia14]

I do not understand the explanation that is given in the book, please can you expound more and mathematically? Thanks in advance.

[ash2rash]

please type the question

[tommywallach]

Yeah, I do actually need at least piece of it. We have different editions of the book, so this can be hard to search by. It's easiest if you simply write out the question, unless it has diagrams associated with it. Also, I'd love to know where your own methodology goes wrong. How did you start it, and where did you freeze up?

-t