Question

Joey has a comic book collection that he keeps among five shelves with an equal number on each shelf. His father has 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 this equation.

Answer 1

Let x be the number of comic books on each shelf.
The total number of comic books on the bottom shelf is x+20.
The total number of comic books on the four upper shelves is 4x.
The total number of comic books in the collection is x+20+4x = 125.
Combining like terms, we get 5x+20 = 125
Subtracting 20 from both sides, we get 5x = 105
Dividing both sides by 5, we get x = 21
Therefore, the total number of comic books in the collection is 4x+20 = 4*21+20 = <<4*21+20=104>>104. Answer: \boxed{104}.