Answer :
Total number of workers is considered as x
Average of 12 officers salary = 12 x 400 = 4800
4800 + 56x = ( 12 + x ) x 60
4800 + 56x = 720 + 60x
4x = 4080
X = 1020
∴ Total number of workers = 12 + x = 12 + 1020 = 1032
Total no. of workers be x
Their average salary = Rs 60
Total salary of all workers = 60x
Average salary of 12 officers = Rs 400
Total salary of 12 officers = 12 × 400 = Rs 4800
Average salary of rest of employees = Rs 56
Total salary of these rest of employees = (x - 12)×56
⇒ (x - 12)×56 + 4800 = 60x
⇒56x - 672 + 4800 = 60x
⇒ 4x = 4128
⇒ x = 1032
Total number of workers in the factory = 1032
Their average salary = Rs 60
Total salary of all workers = 60x
Average salary of 12 officers = Rs 400
Total salary of 12 officers = 12 × 400 = Rs 4800
Average salary of rest of employees = Rs 56
Total salary of these rest of employees = (x - 12)×56
⇒ (x - 12)×56 + 4800 = 60x
⇒56x - 672 + 4800 = 60x
⇒ 4x = 4128
⇒ x = 1032
Total number of workers in the factory = 1032