In a row, A is in the 11th position from the left and B is in the 10th position from the right.
If A and B interchange their positions, then A becomes 18th from the left.
How many persons are there in the row other than A and B?
🎥 Video solution / Text Solution of this question is given below:
Let total persons = $n$.
B’s position from right = 10 ⇒ from left = $(n - 9)$.
After interchange, A’s new position = 18 = $(n - 9)$.
So, $n = 27$.
Total persons other than A and B = $27 - 2 = 25$.