The ages of the students of a class form an A.P. whose common difference is 4 months. If the youngest student is 8 years old and the sum of the ages of all the students of the class 1s 168 years, find the number of students in the class.

Find the range of heights of any ten students of your class.

The students of Class VIII of a school donated Rs 2401 in all, for Prime Minister’s National Relief Fund. Each student donated as many rupees as the number of students in the class. Find the number of students in the class.

The following table shows the ages of the students during a year are : Find the mode.

Form the pair of linear equations in the following problems and find their solutions (if they exist) by any algebraic method :- Students of a class are made to stand in rows. If one student is extra in a row, there would be 2 rowless. If one student is less in a row, there would be 3 rows more. Find the number of students in the class.

The students of a class are made to stand in rows. If 3 students are extra in a row, there would be 1 row less. If 3 students are less in a row, there would be 2 rows more. Find the number of students in the class.