Answer:
6 students.
Explanation:
3v + c = 22 ---> c = 22 - 3v
2v + 4c = 28 ---> 2v + 4(22 - 3v) = 28
2v + 88 - 12v = 28
-10v + 88 = 28
- 88 - 88
- 10v = - 60
v = 6 students
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