1.

The average age of a class of 40 students is 12 years. if the teacher's age is also included, the average increases by one year. Find the age of the teacher?1. 54 years2. 55 years3. 53 years4. 52 years

Answer» Correct Answer - Option 3 : 53 years

 

FORMULA USED:

Average = Sum of numbers/Total numbers

CALCULATION:

Total age of the class (Only students) = 40 × 12 = 480 years

And

Total age of the class (With teacher) = 41 × 13 = 533 years

Hence,

Age of the teacher = 533 - 480 = 53 years



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