There are five boxes in a box hold. The weight of the first box is $40 \mathrm{kg}$ and the weight of the second box is $50\%$ higher than the weight of the third box, whose weight is $25\%$ higher than the first boxes' weight. The fourth box at $150 \mathrm{kg}$ is $50\%$ heavier than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.

The average price of $3$ precious diamond studded platinum thrones is ₹$97610498312$. If their prices are in the ratio $4:7:9$. The price of the cheapest is

The average weight of $23$ boxes is $3$ kg. If the weight of the container (in which the boxes are kept)is included, the calculated average weight per box increase by $1$kg . What is the weight of container. 

A man covers $1/4$th of his journey by cycle in $40km/h$, the $1/2$ of the remaining by car at $20km/h$, and the rest by walking at $10km/h$. Find his average speed during the whole journey.

The average age of a group of $15$ persons is $25$years and $5$ months. Two persons, each $40$ years old, left the group. What will be the average age of the remaining persons in the group?

The  average  salary of the entire staff in an department  is Rs. $2000$ per month . The average salary of officers is Rs. $3000$ and that of non-officers is Rs. $1500$. If the number of officers is $10$, then find the number of non-officers in the office?