The mean age group of some students is 15years. When the age of a teacher,...
MATHEMATICS
JAMB 2020
The mean age group of some students is 15years. When the age of a teacher, 45 years old, is added to the ages of the students, the mean of their ages become 18 years. Find the number of students in the group.
- A. 7
- B. 9
- C. 15
- D. 42
Correct Answer: B. 9
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