The students ______ the teacher on teachers' day for twenty years of dedicated teaching.

Q. A school has 120 students. Each student attends 5 classes of different subjects and each class has 20 students and 1 teacher. If in a day, a teacher teaches 3 classes, what is the minimum number of teachers in the school?

Q. A teacher teaches students:

Q.

The following histogram shows the frequency distribution of teaching experiences of 30 teachers in various schools :

How many teachers have teaching experience between 10 to 25 years?

Q. In a set of teachers of a school, two teachers are said to be related if they teach the same subject, then the relation is (Assume that every teacher teach only one subject)

Q. The average age of a teacher and three students is $20$ years. If all students are of equal age and the difference between the age of the teacher and that of a student is $20$ years, then the age of the teacher is