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?
Solution
Correct Answer: Option D
এখানে,
15 জন ছাত্রের মোট নম্বর = 15 × 10 = 150
এবং10 " " " " = 10 × 15 = 150
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25 জন ছাত্রের মোট নম্বর= 300
: গড় নম্বর =300/25= 12
15 জন ছাত্রের মোট নম্বর = 15 × 10 = 150
এবং10 " " " " = 10 × 15 = 150
________________________________________________
25 জন ছাত্রের মোট নম্বর= 300
: গড় নম্বর =300/25= 12
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