If the average salary of a firm is Rs. 400 and the number of workers is 60, find the total salary bill of the firm.

In a factory, there arc 30 men and 20 women employees. If the average salary of men is Rs 4050 and the average salary of all the employees is Rs 3550, then what is the average salary of woman ?

The mean monthly salary paid to 75 workers in a factory is Rs 5680. The mean salary of 25 of them is Rs 5400 and that of 30 others is Rs 5700. The mean salary of the remaining workers is (a) Rs 5000 (b) Rs 6000 (c) Rs 7000 (d) Rs 8000

The average salary of workers of a factory is Rs 6000, while the average salary of 150 technicians is Rs 12000 and that of non- technicians is Rs 3750. Find the total number of workers in the factory.