JAMB Mathematics 2021 Objective — Question 13
Question 13 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.
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13. Thirty boys and x girls sat for a test. The mean of the boys' scores and that of the girls were 6 and 8 respectively. Given that the sum of their scores is 468. Find x (a) 22 (b) 38 (c) 41 (d) 36
- A. 22
- B. 38
- C. 41
- D. 36Correct
Explanation
Sum of boys' scores = 30 × 6 = 180. Sum of girls' scores = 8x. Total: 180 + 8x = 468, so 8x = 288, x = 36.
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