$30$ pens and $75$ pencil altogether were purchased for $Rs.\, 510.$ If the average price of $75$ pencil was $Rs.\, 2$ , then what was the average price of a pen? (in $Rs.$)
$9$
$10$
$11$
$12$
The average monthly salary of all the employees in an industry is $Rs.\, 12,000$. The average salary of male employees is $Rs.\,15,000$ and that of female employees is $Rs.\, 8,000 .$ What is the ratio of male employees to female employees?
The average of first $25$ numbers is $10$ and the average of the next $25$ numbers is $12 .$ The average of all $50$ numbers is
The average temperature from Monday to Thursday is $48^{\circ} C$ and from Tuesday to Friday is $52^{\circ} C$. If the temperature on Monday is $42^{\circ} C$, what was it on Friday? (in $^{\circ} C$)
Find the average of the following set of scores $253,124,255,534,836,375,101,443,760$
The average salary of the entire staff in a office is $Rs.\, 120$ per $month.$ The average salary of officers is $Rs.\, 460$ and that of non-officers is $Rs. \,$ $110 .$ If the number of officers is $15,$ then find the number of non-officers in the office ?