Four men have to cross a bridge late at night. The bridge is old and can only hold 2 men at a time and they must use a flashlight to see where they are walking. The men all walk at different speeds and whenever a pair of men cross, since they only have one flashlight, must travel at the slower walkers pace. The man who walks the fastest can cross in 1 minute, the next fastest can cross in 2 minutes, the next in 5 minutes and the slowest can cross in 10 minutes. Someone has to return the flashlight each time so that the next men can cross safely. What is the shortest amount of time needed to get all four men across the bridge?
A builder needs 11 pounds of sand for his pool foundation. The sand supplier has a lot of sand, two large boxes on a balance scale, but only two weights: a 5 pound weight and a 4 pound weight. How can you measure exactly 11 pounds of sand without removing any sand from either of the boxes during the process?
All of my ties are red except two. All of my ties are green except two. All of my ties are black except two. How many ties do I have?
A large truck is crossing a bridge 1 mile long. The bridge can only hold 14,000 lbs which is the exact weight of the truck. The truck gets half way across the bridge and a bird lands on the truck. Does the bridge collapse?
There is a wine barrel with no lid and some wine in it. "This barrel of wine is more than half full," says Larry. "No it's not, says Joe. It's less than half full." Without any measuring implements and without removing any wine from the barrel, how can they determine who is correct?
When the day after tomorrow is yesterday, then 'today' will be as far from Sunday as that day was which was 'today' when the day before yesterday was tomorrow! What day of the week is it?
A man is in a room, the door is locked and he can't get out. In the room, he has a piano, a calendar, and a bed. How does he eat, drink and escape?
A man wanted to leave all of his money to one of his three sons, but he couldn't decide which one should get the fortune. He decided to test their resourcefulness; so he gave each of them a few coins and told them to buy something that would be able to fill their living room. The first son bought straw, but there wasn't enough to fill the room. The second son bought some sticks, but he didn't have enough to fill the room either. The third son bought two items and he filled the room. He obtained his father's fortune. What did he purchase?
I was relaxing on a park bench one day when I noticed there were ducks in the pond. I saw two ducks in front of a duck, two ducks behind a duck and one duck exactly in the middle of the other ducks. How many ducks were there?
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