The average of $20$ numbers is $30$ and that of other $30$ numbers is $50$. What is the average of all the numbers?

The average of a batsman after $25$ innings was $56$ runs per innings. If after the $26^{th}$ inning his average increased by $2$ runs,then find his score in the $26^{th}$ inning?

The average of five consecutive positive integers is $n$. If the next two integers are also included,the average of all these integers will

The average of $50$ numbers is $30.$ If two numbers,$35$ and $40$ are discarded,then the average of the remaining numbers is nearly.

The average of three numbers is $28$. If the first number is half of the second and the third number is twice the second,then the third number is?

$A$ club has $15$ men and $25$ women. The average age of men is $10 \text{ years}$ and the average age of women is $12 \text{ years}$. What is the average age of the whole club in years?