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ATQ,
Let the efficiency of each worker be 'e' units/day.
So, total work = 12 × 18 × e = 216e units
And work done in first 8 days = 12 × 8 × e = 96e units
So, work left = 216e - 96e = 120e units
Now, remaining workers = 12 - 4 = 8
So, time needed = 120e ÷ (8 × e) = 15 days
Additional days = 15 - 10 = 5 days
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