Question

the average age of a class of 40 students is 18 years when the teachers age is also included to calculate the average age becomes 19 years what is the teachers age

Answer 1

Answer:

Step-by-step explanation:

Let the sum of all ages be x

Average age= sum of all ages/total number of students

18=x/40

18*40=x

720=x

Sum of all ages is 720.

Now let the teacher’s age be y

Average age after teacher’s age is 19

Total no of people=40+1

=41

Therefore,

19=720+y/41

19*41=720+y

779=720+y

779-720=y

59=y

The teacher’s age is 59.

Answer 2

Answer:

As per question, the teacher's age when added to the total age of the 40 students and divided by the number of people, the average age becomes 19. So it's observed that if one person is added, the total age of the class becomes 779 from 729. Therefore the age of the teacher is 50 yrs.