Answer:
16/25
Explanation:
You want to know the fraction that are not 7th graders, if 0.36 of the students are 7th graders.
Complement
The fraction that represents all of the students is 1.00. The total of 7th-grade students and not-7th-grade students will be 1.00, so we have ...
0.36 + x = 1.00 . . . . . . where x is the fraction that are not 7th graders
x = 1.00 -0.36 = 0.64 . . . . . . the fraction that are not 7th graders
This decimal fraction can be written as the ratio of integers:
0.64 = 64/100 = 16/25 . . . . . . . . reduced form
The fraction of students that are not 7th graders is 16/25.
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