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. 8
- C. 12
- D. 15
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বিসিআইসি | সহকারী প্রকৌশলী (কমার্শিয়াল) | 10-12-2021
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