The average monthly salary of the employees is $₹320$. Out of these employees, $12$ officers get an average salary of $₹2,000$ per month and the rest an average salary of $₹280$. Find the number of employees?

A man covers a journey from Meerut to Delhi by car at an average speed of $40 \mathrm{km}/\mathrm{hr}$. He returns by scooter with an average speed of $24 \mathrm{km}/\mathrm{hr}$. Find his average speed during the whole journey?

A batsman makes a score of $87$ runs in the ${17}^{\mathrm{th}}$ inning and thus increases his average by $3$. Find his average after ${17}^{\mathrm{th}}$ inning?

The average weight of $10$ oarsmen in a boat is increased by $1.5 \mathrm{kg}$. When one of the crews, who weighs $68 \mathrm{kg}$ is replaced by a new man. Find the weight of the new man?

The mean temperature of Monday to Wednesday was $37°\mathrm{C}$ and of Tuesday to Thursday was $34°\mathrm{C}.$ If the temperature on Thursday was $\frac{4}{5}$ that of Monday, the temperature on Thursday was:

The average of $12$ results is $15$ and the average of the first two is $14$. What is the average of the rest?

The average monthly salary of the employees of a firm is ₹ $60$, out of the employees $12$ officers get an average of ₹ $400$ per month and the rest an average of ₹ $56$ per month, find the number of employees?

Ten years ago, the average age of a family of $4$ members was $24$Years. Two children having been born, the average age of the family is the same today. What are the present ages of the two children, assuming that the children age differs by$2$Years.

The average of $9$ results is$50 .$ The average of first four results is$52$ and average of last four results is $49 .$ What is the fifth result?