Question

The mean age of a class is 16 years . If the class teacher aged 40 years old is also included, the mean age increases to 17 years. The number of students in the class are:

Answer 1

let total no. be X
then 16X = total age
16X+40= new total age
(16X+40)/X+1=17
X=23 = total no. of students

Answer 2

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$<b><u>Answer</u></b>$

$<b>Total number of students in a class = 23.</b>$

$<b><u>Step-by-step explanation</u></b>$

$<b>Assumption:</b>$

Let total number of students in a class be $<b>x.</b>$

Then, 16x = total age

16x + 40 = Total new age

Total number of students = $\frac{(16x+40)} + {x + 1}$

Total number of students = x = 23

$<b>Therefore, there're 23 students in a class.</b>$

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