A and B are facing North. Starting from the extreme right, A moves to the 6th place to the left, and starting from the extreme left, B moves to the 7th place to the right. Now A is to the immediate right of B. How many persons are there in the row?

Among five friends Pinky, Pooja, Prachi, Neha, and Payal: Pinky is older than only Pooja. Prachi is older than both Pooja and Pinky. Also, Prachi is younger than Neha, who is not the oldest. Who is the oldest?

Suraj ranked 17th from the bottom and 13th from the top in his class. How many students are there in his class?