Question

The average age of a class of 20 students is 28. When the teacher joins the class, the average age is increased by 2. Find the age of the teacher ?

Answer 1

Answer:

Average age of the teacher = 70 years

Step-by-step explanation:

Average of 20 students = 28 years

Total age of 20 students

= 20 × 28

= 560 years

When teacher included average become 30 years

Now, total age 20 students and teacher

= 30 × 21 = 630 years

∴ Age of teacher

= 630 - 560

= 70 years