In a row of 21 students, when Murali was shifted by four places towards the right, he became 12th from the left end. What was his earlier position from the right end of 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?