averages Questions

The average age of a group of $8$ people is $20\text{years}$. One person leaves the group and the average age becomes $18\text{years}$. Find the age of the person who left.

The average of six numbers is $12$. The average of two of them is $6.5$, while the average of the other two is $4.5$. What is the average of the remaining two numbers?

The average age of a husband, his wife and their child $4$ years ago was $30\text{years}$. The average age of the wife and the child $6$ years ago was $22\text{years}$. Find the present age of the husband.

The average monthly salary of the workers in a workshop is ₹$8,500$. If the average monthly salary of $7\text{workers}$ is ₹$10,000$ and average monthly salary of the rest is ₹$7,800$, the total number of workers in the workshop is:

If the average of $6$ consecutive even numbers is $183$, find the smallest number.

The average of marks obtained in an examination by 8 students was 5.1 and by 9 other students was 6.8. The average marks of the 17 students were: