Question

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

Answer 1

Answer:

Step-by-step explanation:

Let total no. of students be x

Thus, total age of all students = 16x

Now, when teacher is included, no. of persons = x + 1

New mean = 17

Therefore, the equation so formed will be 17(x + 1) = 16x + 40

=> 17x + 17 = 16x + 40

=> x = 40 - 17 ( transposing 16x & 17 )

=> x = 23

Therefore, total number of students in the class is 23.