Q.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.
Q.12- The average marks of four subjects is 120. If 33 was misread as 13 during the calculation, what will be the correct average?
Q.13- A pupil’s marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half 1212 . The number of pupils in the class is:
Q.14- A man travels equal distances of his journey at 40, 30 and 15 km/h. respectively. Find his average speed for whole journey.
Q.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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