1.

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»

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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