SSC CHSL MATHS(AVERAGE) QUIZ

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Question 1:

The average age  of 40 students of a class is 12 years. 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