Question

The average age of 50 pupils in a clss is 10.5.if the class teacher is included,the average increases by 5.then the age of the class teacher is

Answer 1

Solution:

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Average age = 10.5

Sum of total age of the 50 students = 50 x 10.5 = 525

After including the teacher

total strength = 51

new average = 10.5 + 0.5 = 11

sum of total age of all 51 = 51 x 11 = 561

the age of teacher = 561 - 525 = 36

So, the age of the teacher is 36 years

Note: I have made a correction in the given question by taking numeral 5 as 0.5.

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