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Question 1:

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 the average age of other 9 students is 16 years. The age of the 15th student is -

Question 2:

The average of 6 numbers is 8 and the average of 8 numbers is 6. What will be the average of both together?

Question 3:

Of the three numbers, the first is twice the second and thrice the third. The average of the numbers is 88. What is the difference between the first number and the third number?

Question 4:

A batsman has an average run in 16 innings. He scored 80 runs in the 17th innings, increasing his average by 2. His average of runs after 17th innings is

Question 5:

The mean of the marks of three students in an examination of total 45 marks is 38. Two fresh students appeared in the examination. What is the lowest score that can be obtained by one of the new students who has scored less marks than the second new student so that the total average of the marks of five students becomes 40 ?

Question 6:

A family consists of two parents and three children. If the average age of the parents is 36 years and that of the children is 10 years. Find the average age (in years) of the family.

Question 7:

A student scores $85 \%$ in an examination. The scores were $79,81,88$ and 94 in 4 subjects. Find the student's score in the 5 th subject, if full marks of each subject is 100.

Question 8:

The average of 4,6,8,12 and $x$ is 7 and the average of $x$, 9,13,15 and $y$ is 9 . What is the value of $2x-3y$?

Question 9:

The average age of 26 students in a class is 15 years. If the teacher's age is included in it, then the average will increase by one. What is the teacher's age (in years)?

Question 10:

The average age of $66 \frac{2}{3} \%$ of the number of children in a group is 13 years. The average age of all the children in the group is $14.5$ years. What is the average age (in years) of the remaining children?