On my bookshelf, my favourite book is the third from the left, and it’s the seventh from the right.
How many books are there on that shelf?
Try drawing the shelf or go grab some books to try it out!
There are 2 books to the left of my favourite book, and 6 books to its right. And my book also counts!
2 + 1 + 6 = 9
So there are 9 books on the shelf.