In a row of boys, if Akhil who is 13th from the left, and Firoz who is 6th from the right end interchange their positions, Akhil becomes 23rd from the left. How many boys are there in the row?

Given: 

In a row of boys, if Akhil who is 13th from the left, and Firoz who is 6th from the right end interchange their positions, Akhil becomes 23rd from the left.

After the swap, Akhil is in Firoz’s original position, and now he is 23rd from the left.

That means Firoz’s original position = 23rd from the left.

But we were told that Firoz was 6th from the right in his original position.

Total boys = Position from left + Position from right - 1

= 23 + 6 - 1

= 29 - 1

= 28

28 boys are there in the row.

Thus, correct option is (a).