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 ?
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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
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