There are two examination rooms A and B. If 10 candidates are sent from A to B, the number of students in each room is same. If 20 candidates are sent from B to A, the number of students in A is double the number of students in B. Find the number of students in each room.

There are some students in the two examination halls A and B. To make the number of students equal in each hall, 10 students are sent from A to B but, if 20 students are sent from B to A, the number of students in A becomes double the number of students in B, then find the number of students in the both halls.

In a classroom, the students have to sit in four rows. Find the rule for the number of students in the class if the number of students in each row is n.

There are 102 teachers in a school of 3300 students. Find the ratio of the number of teachers to the number of students.

45% of the students in a school are boys. If the total number of students in the school is 880, find the number of girls in the school.

The ratio of the number of girls to that of boys in a school is 9: 11. If the number of boys in the school is 2035, find : the number of students in the school.

The students of class VIII of a school donated Rs 2401 for PM’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.

In a class of 36 students, 20 are girls and the rest are boys. Find the ratio of: the number of boys to the total number of students in the class.

At an annual function of a school each student gives gift to every other student. If the number of gifts is 1980, find the number of students.

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.

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.