8 workers finish a job in 6 days at the same pace. How many days would 12 workers need?

1. Workers and days are inversely proportional, so their product is constant. 2. 8 x 6 = 48 worker-days. 3. 48 / 12 = 4 days; 9 days wrongly treats it as direct proportion. _Source: Wikipedia, Proportionality (mathematics), Inverse proportionality_