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1. The average mark obtained by 15 students was 10 and the average mark obtained by 10 students was 15. What was the average mark obtained by all students?
- A. 10
- B. 10
- C. 10
- D. 10
Answer: Option C
Explanation:
Total mark of first 15 students = 15 * 10 = 150
Total mark of first 10 students = 15 * 10 = 150
Total mark of 25 students = 150 + 150 = 300
Average = 300 / 25 = 12
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