Do ourselves (Chapter 1.7)
Exercise
In a line of students, Raton is eight from the tail, and there are 9 more students in front of him. How many students are there in a line?
There are 17 students in a line
Akash is reading a book. He is now reading the 9th page, and there are 7 more pages. How many pages in this book?
There are 16 pages in this book