Question

Average age of a child in a class of 35 is 11.the average age ,including teacher is 12.how old is the reacher

Answer 1

$total \: age \: of \: children = 35 \times 11 = 385 \\ if \: we \: include \: teacher \: then \: total \: age = 36 \times 12 = 432 \\ teachers \: age = 432 - 385 = 47 \: years$

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Answer 2

total age of child = 35×11 = 385
including the teacher,
the total age = 36×12= 432
the age of the teacher = 432-385 = 47 (answer)