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

Explanation:-

$$\eqalign{ & {\text{Let}}\,{\text{the}}\,{\text{rest}}\,{\text{workers}} = x \cr & {\text{Now,}}\,{\text{According}}\,{\text{to}}\,{\text{question}}, \cr & \left( {7 + x} \right) \times 8000 = 12000 \times 7 + 6000x \cr & 56000 + 8000x = 84000 + 6000x \cr & 2000x = 28000 \cr & x = 14 \cr & {\text{So}}\,{\text{total}}\,{\text{no}}\,{\text{of}}\,{\text{worker}} = 14 + 7 = 21 \cr}$$