X is 10th from the beginning of a queue and 13th from the end of the queue. How many people are there in the queue?

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• A 21
• B 23
• C 24
• D 22

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Answer: D. 22

10th from beginning means 10 people including x. 13th from end means 12 more people behind x. So total is 10 + 12 = 22

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