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The mean age of a group of students is 15 years. When the age of a teacher, 45 years ...

The mean age of a group of students is 15 years. When the age of a teacher, 45 years old, is added to the ages of the students, the means of their ages becomes 18 years. Find the number of students in the group.

A. 7
B. 9
C. 15
D. 42




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