Some students, including Rohit and Pranshu, are standing in a queue.
How many students are standing in the queue?
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Let the number of students standing in the queue be n . Then the position Rohit was originally standing, the 4th from the last is number ( n − 3 ) th from the front. He switched positions with Pranshu, but the position is still remained as ( n − 3 ) th from the front, which is 9th. Therefore, n − 3 = 9 , ⟹ n = 1 2 .