SOLUTION: Helping my grandson with some home work. I’m 60 years old and have not spent much time with algebra. Here’s the question. Brian has $50. He buys 20 similar books and has x dollars

Algebra ->  Finance -> SOLUTION: Helping my grandson with some home work. I’m 60 years old and have not spent much time with algebra. Here’s the question. Brian has $50. He buys 20 similar books and has x dollars      Log On

Each book costs    dollars.

Let cost of each book be B

Then total cost of books = 20B 

Also, total cost of books = 50 - x

We then get: 20B = 50 - x

Cost of each book, or