The average salary of employees of a factory is ₹15,000. The average salary of 250 of the employees is ₹16000 and that of remaining employees is ₹13750 . Total number of the employees in the factory is:

450

The average salary of all the workers in a factory = Rs.15,000

Average salary of 250 employees = Rs. 16,000 

Average salary of the Rest of the workers = Rs. 13750

Average = Sum of observations / Number of observations

Let the number of employees be "x"

Total salary of all workers = 15000x

Total salary of 250 employees = 16000 × 250 = 4000000

Total salary of rest of the workers = 13750 (x - 250) = 13750x - 3437500

According to question

15000x = 13750x – 3437500 + 4000000

x = 450