In a row of girls, if Rupa is Ninth from the left and Shikha is tenth from the right. On interchanging their positions, Rupa becomes sixteenth from the left. How many girls are there in the row?

25

The correct answer is Option (3) → 25

Let the total number of girls be N.

Given:

• Rupa is 9th from the left.
• Shikha is 10th from the right.
• After interchanging positions, Rupa becomes 16th from the left.

Step 1: Find Shikha’s original position from the left

If Shikha is 10th from the right, then from the left her position is:

$N - 10 + 1 = N – 9$

Step 2: Use the interchange condition

After interchange, Rupa takes Shikha’s original position.

So,

$N−9=16$

$N = 25$