The sum of five consecutive integers is $a$ and the sum of next five consecutive integers is $b$. Then $\frac{(b-a)}{100}$ is equal to
$\frac{1}{4}$
$\frac{1}{2}$
$3$
$2$
A batsman has a certain average in $11$ innings. In the $12^{\text {th }}$ innings, he scores $90$ runs and his average decreases by $5 .$ After the $12^{\text {th }}$ innings what is his average?
Of the $3$ members whose average is $22 .$ What is the first number ?
Visitors to a show were charged $Rs.\, 15$ each on the first day, $Rs.\, 7.50$ on the second day, $Rs.\, 2.50$ on the third day and total attendance on three days were in the ratio $2: 5: 13$ respectively. The average charge per person for the entire three days is (in $Rs.$)
In a class of $100$ students, the mean marks obtained in a subject is $30$ and in another class of $50$ students the mean marks obtained in the same subject is $60 .$ The mean marks obtained by the students of two classes taken together is
The average of the first nine integral multiples of $3$ is