The average of a child 35 classes is 11 the average include techer is 12.how old the teacher
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Step-by-step explanation:
Average age of 30 students=9
Total age of 30 students = 30 ×9=270 (1)
Average including teacher (31 person, 30 students + 1 teacher) =10
Total age including teacher=31×10=310
Age of 30 students + age of teacher =310
By(1) Replace Age of 30 students with 270
270 + Age of teacher = 310
Age of teacher =310–270=40.
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