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Three-mode answers to mathematics in three schools
Solution: The number of students in the second school accounts for 3/4x7/(7+8)=7/20, and the number of students in the second school accounts for 3/4x8/(7+8)=2/5.

The total number of people is: 63 ÷ (2/5-1/4) = 63x20/3 = 420 (people).

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