In a row of boys, Srinath is 11th from the left and Venkat is 24th from the right. If they interchange their positions, Srinath becomes 5th from the left. How many boys are there in the row?

In a row of 47 people facing north, Umesh is 15th from the right end. If Ketan sits 19th to the left of Umesh, what is Ketan's position from the left end of the line?

Jhanvi ranked 14th from the top and 6th from the bottom in her class. How many students are there in the class?