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Let number of students in the class be n and the number of sweets be X.
X = 3n + 16
X = 5n - 12
3n + 16 = 5n - 12
n = 14
X = 58
X = 3n + 16
X = 5n - 12
3n + 16 = 5n - 12
n = 14
X = 58