Average age of 15 students of a IUB class is 11 years If the teacher is aslo included the average age becomes 13 years How old is the teacher
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Let sum of the age of the 15 students be x years
∴ x/15 = 11
=> x = 11×15
= 165 years
Let age of the teacher be y
∴ (165+y)/(15+1) = 13
=> 165+y = 13×16
=> 165+y = 208
=> y = 208-165 = 43 years
∴The teacher is 43 years old.
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Answer:43
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