Since Arun and Suresh interchange places, so Arun’s new position (13th from left) is the same as Suresh’s earlier position (6th from right).So, number of children in the queue = (12 + 1 + 5) = 18.Now. Suresh’s new position is the same as Arun’s earlier position fifth from left.Therefore Suresh’s position from the right = (18 – 4) = 14th.