Question

The average age of 20 teachers in a school is 34. A teacher aged 55 retired, and another, aged 35, joined the school. What is the average age now?​

Answer 1

Answer:

average age=660

Step-by-step explanation:

average = sum of age of 20 teacher/total no teacher

34 = sum of all age of teacher/20

34×20 = sum of all age teacher

680 = sum of all age teacher

680 -55 = sum of all 19 teacher

625 = sum of all 19 teacher

625+35 = sum of all age of teacher

660 = sum of all age of teacher