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(Chinese version S) Final Simulation Test Paper of Grade Five Mathematics in Primary School (Volume II) (Tiexi District Final Simulation Volume C)
It means that 1/2 is a senior student, 1/3 is a middle-grade student,110 is a junior student, and the rest are two tutors.

The total number of teachers and students is 2 ÷ [1-(1/2)-(1/3)-(110)] = 2 ÷ (1/60)

(1/2) is "half"

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