Disha Expert Team Solutions for Exercise 1: EXERCISE

The average of $30$ numbers is $40$ and that of other $40$ numbers is $30$. The average of all the numbers is _____ .

The average weight of $12$ crewmen in a boat is increased by $\frac{1}{3} \mathrm{kg}$, when one of the crewmen whose weight is $55 \mathrm{kg}$ is replaced by a new man. What is the weight of the new men?

The average of five numbers is $57.8$. The average of the first and the second numbers is $77.5$ and the average of the fourth and fifth numbers is $46$. What is the third number?

Find the average of first $20$ multiples of $7$.

 Average of five numbers is $61$. If the average of the first and third number is $69$ and the average of the second and fourth number is $69$, what is the fifth number?

The average weight of $19$ men is $74 \mathrm{kgs}$ and the average weight of $38$ women is $63 \mathrm{kgs}$. What is the average weight (rounded off to the nearest integer) of all the men and the women together?

The average weight of $15$ girls was recorded as $54 \mathrm{kg}$. If the weight of the teacher was added, the average increased by $2 \mathrm{kgs}$. What was the teacher’s weight?

 Find the average of the following set of scores:

$152, 635, 121, 423, 632, 744, 365, 253, 302$