The average mark obtain by 15 students was 10 and the average mark obtained by 10 students was 15. What was the average mark obtined by all students?

A 10
B 12.5
C 15
D 12

Correct Answer: 12

Mark obtained by 15 students = 15*10 = 150Mark obtained by 10 students = 10*15 = 150Total marks = 150+150 = 300Total students = 15+10 = 25Now, average mark obtained by all students = 300/25 = 12 (Ans)
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#পিএসসি ও অন্যান্য নিয়োগ পরীক্ষা #গণিত #গড় (Average) #বিসিআইসি | সহকারী প্রকৌশলী (কমার্শিয়াল) | 10-12-2021

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