a) 20
b) 21
c) 22
d) 23
Answer: b
Explanation: Let the rest workers = x
(7 + x) × 8000 = 12000 × 7 + 6000x
56000 + 8000x = 84000 + 6000x
2000x = 28000
x = 14
Total number of worker = 14 + 7 = 21
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