Somu ranks fourth among 30 boys in a class. Riya is three ranks below Somu in the class. What is Riya's rank from the bottom of the class?

In a row of people all facing north, Raj is 12th from the right end. Dev is 22nd from the right end. Dev is exactly between Raj and Mallik. If Mallik is 19th from the left end of the line, how many people are there in the row?

In a row of people all facing north, Jug is 22nd from the left end. Ansh is 26th from the left end. Ansh is exactly between Jug and Radha. If Radha is 15th from the right end of the line, how many people are there in the row?