The mean age of a group of students is 15 years. When the age of
MATHEMATICS
JAMB 2004
The mean age of a group of students is 15 years. When the age of a teacher, 45 years old, is added to the age of the students, the mean of their ages becomes 18 years. Find the number of the students in the group
- A. 9
- B. 7
- C. 42
- D. 15
Correct Answer: A. 9
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