In a row of girls, Geetanjali is 20th from the right end and Sapna is 10th from the left end. When they interchange their positions Geetanjali becomes 25th from the right end. What is the total number of girls in the row?
34
When Geetanjali and Sapna interchange positions, Geetanjali takes Sapna's original position, which is 10th from the left end.
If the total number of girls is \(N\), a person who is 10th from the left is \(N - 10 + 1\) from the right end.
Since Geetanjali becomes 25th from the right after the swap, \(N - 9 = 25\).
Solving gives \(N = 34\), so the total number of girls in the row is 34.
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