In a row of students, Vijay is 11th from the left end, and Hemant is 17th from the right end. If both of them interchange their positions, Vijay becomes 15th from the left end. How many students are sitting between Hemant and Vijay?

In a row of 37 people facing north, Gayatri is 10th from the right end. If Mayank sits 12th to the left of Gayatri, what is Mayank's position from the left end of the line?

In a row of 56 students facing North, Yen is 21st from the right end. If Dollar is 19th to the left of Yen, what is Dollar's position from the left end of the line?