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?

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