There are 4 times more read book pages than unread pages. How many pages can a book

There are 4 times more read book pages than unread pages. How many pages can a book have: 142 pages, 144 pages, or 145 pages? How many pages of the book have been read?

Let x be the number of unread pages in the book. Since the number of pages read in the book is 4 times more than the number of unread pages, the number of pages read is 4.

1) If there are 142 pages in the book, then the equality 4x + x = 142 must be fulfilled, and the value of x must be an integer. Let’s solve the equation: 5x = 142, x = 142: 5, x = 28.4. A book cannot have 142 pages.

2) If there are 144 pages in the book, then the equality 4x + x = 144 must be fulfilled, and the value of x must be an integer. Let’s solve the equation: 5x = 144, x = 144: 5, x = 28.8. A book cannot have 144 pages.

3) If there are 145 pages in the book, then the equality 4x + x = 142 must be fulfilled, and the value of x must be an integer. Let’s solve the equation: 5x = 145, x = 145: 5, x = 29. There cannot be 142 pages in a book. Pages read: 4 * 29 = 116.