Question 1
In a row, Divya is 10th from the left and Tarun is 21th from the right. They interchange their positions. Now, Divya becomes 17th from the left. What is the total number of people in the row?
When positions are interchanged, using one person's rank from the left and the other's rank from the right at the interchanged positions: T = L + R - 1 = 17 + 21 - 1 = 37.