L Mohan Lal Solutions for Exercise 2: PREVIOUS QUESTIONS

The average of $25$ numbers is $10$. If each number is added by $5$, then what will be the new average?

The average of five numbers is $20$ and the average of three of these numbers is $15$. Find the average of the other two numbers?

In a class of $60$ students, the average weight of $30$ students is '$x$' $kg$ and that of the remaining $30$ students is '$y$' $kg$. Find the average weight of the class.

The average weight of $11$ items is $8 kg$. If one item is sold, then the average weight decreases by $\frac{1}{2} kg$. The weight of the sold item is:

The average weight of three boys $A, B$ and $C$ is $54\frac{1}{3} kg$, while the average weight of three boys $B, D$ and $E$ is $53 kg$. What is the average weight of $A, B, C, D$ and $E$?

The average salary of all the workers in a workshop is $Rs.8000$. The average salary of $7$ technicians is $Rs.12000$ and the average salary of the rest is $Rs.6000$. The total number of workers in the workshop is:

The average age of $3$ persons is $23$. Even if the age of $4th$ person is added, the average of four remains $23$. What is the age of the $4th$ person ( in years )?

The average of two numbers is $27$. If the first number is half of the second, what is the second number?