In a row of girls, Sita is 12th from the left and Radha is 16th from the right. If they interchange their positions, Sita becomes 20th from the left. What is Radha's new position from the right?
Show answer & explanation
Correct answer: A
Explanation
Sita and Radha have swapped places, so Sita is now in Radha's old position.
Sita's new position (from the left) = 20
This means Radha's old position (from the left) = 20
Radha's old position (from the right) = 16
Total = Position from the left + Position from the right − 1
Total = 20 + 16 − 1 = 35
Total girls = 35
Radha's new position
Now Radha will be in Sita's old position (12th from the left).
Extracting positions from the right
Right = 35 − 12 + 1
= 24