In a row of students Pankaj is 11^th from the right and Pramod is 18^th from the left. When they interchange their positions, Pankaj becomes 18^th from the right. Then what will be the position of Pramod from left ?

In a row of students, Kiran is at $7^{\mathrm{th}}$ place from the left and Punam is at ${21}^{\mathrm{st}}$ place from the right. When they interchange their positions Kiran becomes ${20}^{\mathrm{th}}$ from the left. How many students are there in all?

In a row of boys, Udai is $23\mathrm{rd}$ from the left and Ashok is $8\mathrm{th}$ from the right. When they interchange their positions Udai becomes $18\mathrm{th}$ from the left. What will be the position of Ashok from the right?