ose has a comic book collection that he keeps among 5 shelves with an equal number on each shelf. His father adds 20 comic books to the bottom shelf, so the shelf now has 125 books. How many total books are in his collection? Use algebra to solve the equation.

Answer 1

Let x be the number of books on each shelf.
The number of books on the bottom shelf is x+20, because Ose's father added 20 comic books.
125 = 5x + (x + 20)
125 = 6x + 20
6x = 125 - 20
6x = <<105=105>>105
x = <<21=21>>21
There are 21 books on each shelf.
The total number of books in Ose's collection is 21*5=<<21*5=105>>105. Answer: \boxed{105}.