The average salary per head of all the workers in a company is $Rs. \,95.$ The average salary of $15$ officers is $Rs.\, 525$ and the average salary per head of the rest is $Rs. \,85.$ Find the total number of workers in the workshop.
$660$
$580$
$650$
$460$
A batsman in his $17^{th}$ innings, makes a score of $85$ runs, and there by, increases his average by $3$ runs. What is his average after the $17^{th}$ innings ? He had never been $'not out'.$
What is the average of all numbers between $100$ and $200$ which are divisible by $13\, ?$
The average of $50$ numbers is $38 .$ If two numbers, namely, $45$ and $55$ are discarded, what is the average of the remaining numbers ?
The average score of Rahul, Manish and Suresh is $63.$ Rahul's score is $15$ less than Ajay and $10$ more than Manish. If Ajay scored $30$ marks more than the average score of Rahul, Manish and Suresh, what is the sum of Manish's and Suresh's scores ?
Of the three numbers, the average of the first and the second is greater than the average of the second and the third by $15 .$ What is the difference between the first and the third of the three numbers?