The total number of students that are in the seventh grade are 378 students.
The number of students that had already bought tickets will be:
= 158 - 32 = 126 students.
Therefore, based on the information given, the equation to calculate the total students will be:
= (1/3 × x) = 126
x = 3 × 126
x = 378
Therefore, there are 378 students.
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