hard · GMAT Quant
Two contractors, working alone, would take 20 days and 30 days respectively to renovate a house. They work together for 5 days, after which a third contractor joins and the trio finishes the remaining work in exactly 3 more days.
If the third contractor could have completed the entire renovation alone in a whole number of days, how many days would that be?
- 6 days
- 9 days
- 12 days
- 15 days
- 18 days
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