Question

The sum of ages of a teacher and his student is 80 years, 8 years ago, the teacher's age was 10 times the age of his student.
Find present age of teacher?
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Answer 1

Answer:

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. Ans….

Step-by-step explanation:

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