/kloc-what is the math book with line 0/5?
The math problem is a math book, 15 lines. Look at this exercise book. If it is 20 pages 15 lines, if it is 15 pages with 20 lines. All the exercise books are in a blank, and they are generally marked. If there is a cross, you need to count it yourself. Therefore, the math problem is a math book with 15 lines.