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?
ক. 10
খ. 8
গ. 12
ঘ. 15
উত্তর: 12
ব্যাখ্যা: Total mark of first 15 students [গণিত] Total mark of first 10 students [গণিত] Total mark of 25 students [গণিত] Average [গণিত]
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