Teacher

There are six teachers.Out of them tow are primary teacher,two are middle teachers,and two are secondary teachers.They are to stand in a row,so as the primary teachers,middle teacher,and secondary teachers,middle in a set.Find the number of ways in which they can do so.

There are 25 teacher in a school , the average age of teacher is 40. If a teacher of 60 years of age is retired than a new teacher is appointed in place of him and the average decreases to 39 . find the age of teacher appointed

Statements: Some teachers are proferssors. Some lectures are teachers. Conclusions: I. All teachers as well as professors being lectures is a possibility II. All those teachers who are lectures are also proferssors.

In the given figure 10% are students and parents and the 10% are students, teachers and parents, 15% are teachers and parents, 35% are students and teachers, How many percentage are only teachers, parents and students?

The ages in years of 10 teachers of a school are: 32,41,28,54,35,26,23,33,38,40 (i) What is the age of the oldest teacher and that of the youngest teacher? (ii) What is the range of the ages of the teachers? (iii) What is the mean age of these teachers?

Out of 10 teachers of a school, one teacher retires and in place of him a new teacher 25 years old joins. As a result of it average age of the teachers reduces by 3 years. Age of the retired teacher (in years) is: (a) 55 (b) 60 (c) 58 (d) 56