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

How old is the teacher?

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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.

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

The correct option is C 63 Average 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 average age of a class of 50 students is 12. The average age including the teacher becomes 13.

How old is the teacher?

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.