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.

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.

There are 20 girls and 15 boys in a class. What is the ratio of number of girls to the total number of students in the class?

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.

A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

5 students stand in a row.Write the rule for the number of students for a given number of rows.(Use n for the number of rows.)

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.