সব প্রশ্নে ফিরে যান
Math
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
সঠিক উত্তর
BCIC সহকারী প্রকৌশলী 2021