13. The average age of 24 boys in a class is 16. If the teacher is included
in the group and one boy is excluded from the group, the average
increases by one. What is the age of the teacher ?
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Answer:
the average age teacher is 18
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Answer:
Total boys = 24
The average age of boys = 16
Total age = 24×16 = 384
Excluded one boy = total age = 23×15 = 345
Included a teacher = total age = 384+1 = 385
Teacher age = 385-345
= 40 years
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