Participated 81728
The school volleyball tournament was played on a one-on-one basis. One match lasted 15 minutes, and 3 hours and 45 minutes were played. Calculate how many teams participated.
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- combinatorics
- combinatorial number
- permutations
- multiplication principle
- algebra
- quadratic equation
- equation
Units of physical quantities:
Grade of the word problem:
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