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Direct Method of Finding Mean

The average a...

Question

The average age of 30 student is 20 year and average age of 20 other student is 30 year. The average age of total number of student is

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Q. The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. The average age of the remaining students is

Q. The Average age of 20 students in a class is 16 yars.One student whose age is 18 years has left the class. Find out average age of rest of the students.

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

Q. In a group of

20

students the average age of the students is

10

years. A boy leaves the group and the average is decreased by

1

year. Find the age of that boy.

Q. Choose the correct answer from the alternative given.
The average age of 15 students of a class is 15 years Out of these the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is:

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Direct Method of Finding Mean

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