Question
49 people were in a queue to return their library books . Ivan was the 9th person from the front. Riordan was the 11th person from the back. How many people were standing between Ivan and Riordan?
2 m

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49 people were in a queue to return their library books . Ivan was the 9th person from the front. Riordan was the 11th person from the back. How many people were standing between Ivan and Riordan?