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The number of students in the 9th grade is 250.
Based on the information, the percentage of those who brought their good from home will be:
= 100 - 24%
= 76%
Therefore, 76% of x = 190
0.76x = 190
x = 190/0.76
x = 250
Therefore, the number of students in the 9th grade is 250.
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