The average salary of all the workers in a workshop is Tk. 8,000. The average salary of 7 technicians is Tk. 12,000 and the average salary of the rest is Tk. 6,000. The total number of workers in the workshop is:

Question: The average salary of all the workers in a workshop is Tk. 8,000. The average salary of 7 technicians is Tk. 12,000 and the average salary of the rest is Tk. 6,000. The total number of workers in the workshop is:

Solution:
Let the number of rest workers = x

Now, According to the question,
(7 + x) × 8000 = 12000 × 7 + 6000x
⇒ 56000 + 8000x = 84000 + 6000x
⇒ 2000x = 28000
⇒ x = 14

So the total number of worker
= 14 + 7
= 21