If 3 workers finish a task in 9 days, how many days will 6 equal workers need?

Question: If 3 workers finish a task in 9 days, how many days will 6 equal workers need?

1. 5 days
2. 4 days
3. 11/2 days
4. 9/2 days

Correct Answer: D — 9/2 days

Explanation: For the same job, workers × time stays constant when rates are equal.
Using the values in this question gives 9/2 days as the correct answer.