Sainik School Entrance Exam 2018 Solved Paper

Question : 13 of 150

Marks: +1, -0

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:

Validate

Solution:

(a) Suppose that number of students in the class be

n

Total age of

n

students

=16 n

ATQ,

17(n+1)-16 n=40

⇒

17 n+17-16 n=40

⇒

n=40-17=23

Hence, number of the students

=23

Go to Question:

Prev Question

Next Question