Embibe Experts Solutions for Chapter: Arithmetic, Exercise 7: Exercise 7

The average of marks in Mathematics for $5$ students was found to be $50$. Later on it was discovered that in the case of one student the marks $48$ were misread as $84$. The correct average is:

The average monthly salary paid to 75 employees in a company is Rs. 1420. The average salary of 25 of them is Rs. 1350 and that of 30 others is Rs. 1425. The average salary of the remaining employees is—

The average age of a committee of $8$ members is $40 \mathrm{years}$. A member aged $55 \mathrm{years}$ retired and his place was taken by another member aged $39 \mathrm{years}$. The average age of the present committee is—

The average of $N$ numbers is $X$. If one of the numbers $A$  is replaced by another one $B$, the new average is $Y$. The new number $B$ equals—

In a village, the average age of n people is $42$ years. But after the verification, it was found that the age of a person had been considered $20$ years less than the actual age, so the new average, after the correction, increased by $1$. The value of $\mathrm{n}$ is

The average salary of all the staff in the office of a corporate house is $Rs. 19750$. The average salary of the officers is $Rs. 32000$ and that of the rest is $Rs. 18000$. If the total number of staff is $600$, the number of officers is:

The average of $5$ consecutive integers starting with '$n$' is '$m$'. What is the average of $6$ consecutive integers starting with $n + 2$?

In a school with $600$ Students, the average age of boys is $12$Years and that of the girls is $11$ Years. Find the number of girls in the school, If the average age of the school is $11$ Years and $9$ Months ?