60. There are 30 boys and 60 girls in a school meeting. If the average age of boys is 12 years and the average age of girls is 10 years. Find out average the age of all the students in the meeting.
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Answer:
Average of 30 boys and 40 girls
=
30+40
30×10+40×8
=
70
300+320
=8.86 yr approx.
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