In a row of students, Mukesh is 8th from the right and Sonia is 8th from the left. When Mukesh and Sonia interchange their positions, Sonia becomes 16th from the left. How many students are there in the row?

In a class of 45 students, Aditya's rank is 12th from the top. What is his rank from the bottom?

In a row of 70 students, Rahul is standing 45th from the right end. How many students are standing between Rahul and the student who is 20th from the left end?