Answer:
D
Explanation:
15 out of 90
Divide both sides by 15
1 out of 6
It is reasonable to assume that the ratio 1:6 will be consistent
1:6
Multiply both sides by 20 to get 120 students
20 : 120
20 people have a Galaxy S21 out of 120, so 120-20, which is 100 don't have a Galaxy S21.
The answer is 100.
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