In a row of students, Deepak is 7th from the left end and Madhu is 12th from the right end. If Deepak and Madhu interchange their positions, Deepak becomes 22nd from the left end. What is the total number of students in the row?

In a class of 58 students, Tanvi secured the 26th rank from the top. Anaya's rank is one position lower (worse) than Tanvi's rank. Find the number of students who secured a lower rank than Anaya.

Mr. Kell ranked 155th from the bottom and 37th from the top in his class. How many students are there in his class?