The sum of five consecutive integers is $a$ and the sum of the next five consecutive integers is $b$. Then $\frac{(b-a)}{100}$ is equal to

The average weight of $21$ boys was recorded as $64 \, kg$. If the weight of the teacher was added,the average increased by $1 \, kg$. What was the teacher's weight (in $, kg$)?

The average of $25$ consecutive odd integers is $55$. The highest of these integers is

$A$ man retired from his service at the age of $60$. He served for $\frac{3}{5}$ of his retirement age. At what age (in $years$) did he join his job?

The average of four consecutive odd numbers is $40$. What is the largest number?

The average of three numbers is $154$. The first number is twice the second and the second number is twice the third. The first number is