Average Questions

The percentage distribution of the number of tires of different brands produced by a specific factory in a year is shown in the given pie-chart. The total number of tires sold is 1350.

What is the difference between the average number of Avon and Firestone tires sold together and the average number of Good year and Dunlop tires sold together?

Study the given table and answer the question that follows. The table shows the yearly production (in thousands) of scooters in five different factories (P, Q, R, S and T) from $1985$ to $1989$:



In which year was the production of scooters in all factories equal to the yearly average number of scooters produced from $1985$ to $1989$?

Three boys, on an average, are $25$ years old, and their ages are in the ratio of $3:5:7$. What is the age of the youngest boy?