JSCE Mathematics 2023 Objective — Question 78
Question 78 of 80 from the Junior Secondary Certificate Examination (JSCE) Mathematics 2023 Objective paper, with the correct answer and a full explanation.
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The average p (arithmetic mean) of n and 9 is the average of 2n and 15, and r is the average of 3n and 18. what is the average of p, q and r in terms of n?
- A. n + 6
- B. n + 7Correct
- C. 2m + 14
- D. 3m + 21
Explanation
p = (n + 9)/2, q = (2n + 15)/2, r = (3n + 18)/2. Average = (6n + 42)/6 = n + 7.
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