A contractor estimates that 3 persons could rewire Jamal's house in 4 days. If he uses 4 persons instead of three, how long should they take to complete the job?
Answer: 3 days
Explanation
Work = Persons × Days = 3 × 4 = 12 person-days
With 4 persons: 12 ÷ 4 = 3 days.
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