## 11. The average monthly salary of 660 workers in a factory is Rs. 380. The average monthly salary of officers is Rs. 2100 and the average monthly salary of the other workers is Rs. 340. Find the number of other workers.

## 12. The average marks of four subjects is 120. If 33 was misread as 13 during the calculation, what will be the correct average?

## 13. Students of three different classes appeared in common examination. Pass average of 10 students of first class was 70%, pass average of 15 students of second class was 60% and pass average of 25 students of third class was 80% then what will be the pass average of all students of three classes?

## 14. A man travels equal distances of his journey at 40, 30 and 15 km/h. respectively. Find his average speed for whole journey.

## 15. Five years ago, the average age of A, B, C and D was 45 yr. with E joining them now, the average of all the five is 49 yr. How old is E?

## 16. Average of 80 numbers are 42. When 5 more numbers are included, the average of 85 numbers become 45. Find the average of 5 numbers.

## 17. Find the average increase rate, if increase in the population in the first year is 30% and that in the second year is 40%.

## 18. One-fourth of certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/h. Find the average speed for the whole journey.

## 19. A batsman makes a score of 270 runs in the 87^{th} inning and thus increase his average by a certain number of runs that is a whole number. Find the possible values of the new average.

^{th}inning and thus increase his average by a certain number of runs that is a whole number. Find the possible values of the new average.

## 20. There are five boxes in cargo hold. The weight of the first box is 200 kg and the weight of the second box is 20% higher than the weight of the third box, whose weight is 25% higher than the first box's weight. The fourth box at 350 kg is 30% lighter than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.

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