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The Unpredictable Elevator

31. Riddles
An elevator is on the 10th floor. It goes down 7 floors, then up 4 floors, then down 6 floors, then up 3 floors, then down 5 floors. On which floor is the elevator now?

    • The elevator is on the 1st floor. (Start at 10, then move down 7 to 3, up 4 to 7, down 6 to 1, up 3 to 4, and down 5 to 1.)

The Poisoned Wine-Brain teaser

32. Riddles
You have 1,000 bottles of wine, one of which is poisoned. You have 10 prisoners, and the poison will kill someone exactly 24 hours after they consume it. You need to find the poisoned bottle within 24 hours. How do you do it?

    •  Label the bottles from 1 to 1,000 and convert each number to binary. Assign each bit to a prisoner (10 bits total). Have each prisoner drink from the bottles where their corresponding bit is a 1. After 24 hours, the prisoners who die reveal which bits are 1 in the binary number of the poisoned bottle.

The Infinite Reflection-brain teaser

33. Riddles
Two parallel mirrors are facing each other, and a candle is placed between them. How many images of the candle will you see?

    • You will see an infinite number of images. Each mirror reflects the candle and the reflection from the other mirror, creating an endless series of reflections.

The Escaping Prisoner-brain teaser

34. Riddles
A prisoner is locked in a room with no windows and only one door. The room is empty except for a mirror and a table. How does the prisoner escape?

    • The prisoner looks in the mirror, sees what he saw, takes the saw, cuts the table in half, two halves make a whole, and he climbs out through the hole.

The Crossing Bridge-brain teaser

35. Riddles
Four people need to cross a bridge at night. They only have one torch, and the bridge is too dangerous to cross without it. The bridge can only hold two people at a time. The four people take different times to cross: 1 minute, 2 minutes, 7 minutes, and 10 minutes. How do they all get across in the shortest time possible?

    • 1. The 1-minute and 2-minute people cross first with the torch (2 minutes).
2. The 1-minute person goes back with the torch (1 minute).
3. The 7-minute and 10-minute people cross with the torch (10 minutes).
4. The 2-minute person goes back with the torch (2 minutes).
5. The 1-minute and 2-minute people cross again (2 minutes).
Total time: 17 minutes.

Person is 15 years old-Brain Teasers

36. Riddles
In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?
    • Answer: The person was born in 2005 BC.

The Infinite Hotel-brain teaser

37. Riddles
A hotel with an infinite number of rooms is fully occupied. A new guest arrives. How can the hotel accommodate the new guest without evicting anyone?

    • Move the guest in room 1 to room 2, the guest in room 2 to room 3, and so on, freeing up room 1 for the new guest. This method works because the hotel has an infinite number of rooms.

The Stolen Necklace-Brain teaser

38. Riddles
A woman stole a necklace and put it in her pocket. However, the next day she found the necklace was gone, yet her pocket was not torn or broken, and nothing else was taken. How is this possible?

    • The woman was a dreamer and dreamed about stealing the necklace. When she woke up, the necklace wasn't there because it never existed in reality.

The Hourglass in a Box

39. Riddles
A box contains 10 different hourglasses, each with a different sand timer value. You randomly pick one hourglass, turn it over, and let it run out. What is the probability that you picked the hourglass that takes the longest time to empty?

    • 1. Start both hourglasses at the same time. 2. When the 4-minute hourglass runs out, flip it immediately. 3. When the 7-minute hourglass runs out, flip it immediately. 4. When the 4-minute hourglass runs out again (at 8 minutes), there is 1 minute of sand left in the 7-minute hourglass. 5. Let that 1 minute pass. You’ve now measured exactly 9 minutes.

A man walking in the rain-Brain Teasers

40. Riddles
A man was walking in the rain. He was in the middle of nowhere. He had nothing and nowhere to hide. He came home all wet, but not a single hair on his head was wet. Why is that?
    • Answer: The man was bald.

Red Yellow and blue house bricks-Brain Teasers

42. Riddles
A red house is made from red bricks. A blue house is made from blue bricks. A yellow house is made from yellow bricks. What is a greenhouse made from? 
    • Answer: Glass

What is it-Brain Teasers

45. Riddles
Who makes it, does not need for it. Who buys it, has no use for it. Those who use it can neither see nor feel it. What is it?
    • Answer: A coffin