The average age of a class of 50 students is 12 years. The average age including the teacher becomes 13 years. The age of teacher is years.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is C 63
Average age of 50 students = 12

Total age = 50 $\times$ 12 = 600

Let the teacher be the 51st member.

Average age now = 13

Total age of 51 = 51 $\times$ 13 = 663

Age of teacher = 663 - 600 = 63 yrs.

Suggest Corrections

Similar questions

Q. The average age of a class of 50 students increases by 1 year if the age of the teacher is included. If the age of the teacher is 61 years, what is the average age of the class excluding the teacher?

The average age of 29 boys of a class is 17 years . When the age of the class teacher is included , the average age becomes 18 years . Find the age of the class teacher.

Q. The average age of a teacher and three students is

20

years. If all students are of equal age and the difference between the age of the teacher and that of a student is

20

years, then the age of the teacher is

There are 30 students in a class whose average age is 20 years. The average age of the boys in the class is 3 less than the average age of the girls in it. If the age of their class teacher, which is between 49 years and 54 years is included with boys, the average age of the boys equals to that of the girls. If the average age of boys as well as the average age of girls are integers, then how many boys are there in the class?

Join BYJU'S Learning Program

The average age of a class of 50 students is 12 years. The average age including the teacher becomes 13 years. The age of teacher is years.

The correct option is C 63Average age of 50 students = 12 Total age = 50 × 12 = 600 Let the teacher be the 51st member. Average age now = 13 Total age of 51 = 51 × 13 = 663 Age of teacher = 663 - 600 = 63 yrs.

The correct option is C 63
Average age of 50 students = 12

Total age = 50 $\times$ 12 = 600

Let the teacher be the 51st member.

Average age now = 13

Total age of 51 = 51 $\times$ 13 = 663

Age of teacher = 663 - 600 = 63 yrs.