In a row of 40 girls, when Purnima was shifted to her left by 4 places, her number from the left end of the row became 10. What was the position of Swati from the right end of the row if Swati was three places to the right of Purnima's original position?

24th

The correct answer is Option (3) → 24th

Step 1: Find Purnima's original position

Let Purnima's original position from the left = x

She is shifted 4 places to the left, then her new position = x - 4

Given: new position = 10

$x−4=10⟹x=14$

Purnima's original position from left = 14

Step 2: Find Swati's position from left

Swati is 3 places to the right of Purnima's original position:

$\text{Swati's position from left} = 14 + 3 = 17$

Step 3: Convert to position from right

Total girls = 40

$\text{Position from right} = 40 - 17 + 1 = 24$