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Question 1:

The average age (in years) of 40 students of a class is 12 . After adding teacher's age, the average age of all of them becomes 13 years. If the retirement age of the teacher is 55 years, then he will retire after

Question 2:

The average of 4 numbers is 60 and the first number is $\frac{1}{3}$ of the sum of the remaining three numbers. Find the first number.

Question 3:

The average of six positive numbers is $12.5$. If the first number is two-third of the sum of the last five numbers, then find the average of the last five numbers.

Question 4:

The averages of the numbers $a$ and $b, b$ and $c, c$ and $d$ are $9,6$ and $4$ respectively. Find the average of $a$ and $d$.

Question 5:

The average of 51 numbers is 52. The average of the first 28 numbers is $50.5$ and the average of the last 24 numbers is $54.5$. If 28th number is dropped, then what will be the average of the remaining numbers?

Question 6:

The average salary of all the employees in a workshop is ₹ 18,000. The average salary of 7 technicians is ₹ 24,000 and that of the remaining employees is ₹ 12,000. What is the total number of employees in the workshop?

Question 7:

The average weight of 14 boys in a class is 40.25 kg and that of the remaining 10 boys is 35.15 kg. Find the average weight of all the boys in the class.

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 of seven consecutive positive integers is 259 . If the next five odd numbers are included, then what is the average of all the numbers (correct to two decimal places)?

Question 10:

The average weight of 5 persons increases by 2.8 Kg when a new person comes in place of one of them weighing 38 Kg. The weight of the new person is