If two painters can paint two rooms in two hours, how many painters are needed to paint eighteen rooms in eighteen hours?
2 painters
If 2 painters complete 2 rooms in 2 hours, one painter paints 1 room every 2 hours. In 18 hours, one painter will complete 9 rooms. Therefore, 2 painters will complete 18 rooms in 18 hours.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Easy. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
Five runners finish a school marathon, and only these facts survive. Jonas finished ahead of Nico. Elena finished ahead of Jonas. Mara finished ahead of Dmitri. Nico finished ahead of Mara. Who finished last?
Four travelers arrive at a narrow suspension bridge at night holding only one flickering torch. The bridge can safely support at most two people at a time. Their individual crossing times are 1, 2, 5, and 10 minutes. When two cross together, they must move at the speed of the slower person. What is the absolute minimum total time required for all four to reach the other side?
The gold coin is bigger than the leprechaun, and the rainbow is bigger than the gold coin. Which one is the middle size?
I have no voice, yet I speak to millions. I have no wings, yet I soar across oceans. I have no brain, yet I remember everything you tell me. What am I?
What has words, but never speaks; has a spine, but no bones; and can take you anywhere without moving an inch?
Five knights stand in a line. Sir Vance is somewhere to the left of Sir Uther. Sir Terry is immediately next to Sir Vance. Sir Ron is at one of the far ends, and Sir Quentin is beside Sir Ron. If Sir Uther is in the middle position (3rd), who is standing in the 1st position on the far left?