In a row of people all facing north, Sana is 3rd from the right and Anu is 10th from the right. Anu is exactly between Sana and Riya. If Riya is 4th from the left of the row, how many people are there in the row?

In a row of 39 people facing north, Lavanya sits 17th from the left end. If Rajat sits 5th to the right of Lavanya, what is Rajat's position from the right end of the line?

In a row of 50 students facing north, Hari is 10th from the right end. If Kapil is 4th to the left of Hari, what is Kapil's position from the left end of the line?