100+ Brainteasers with answers for kids and adults

Brainteasers with Answers - "Challenge your brain and improve your problem-solving skills with our collection of brainteasers. From logic puzzles to wordplay, our brainteasers will keep you entertained and engaged for hours. Whether you're a student looking to boost your grades or an adult looking to keep your mind sharp, our brainteasers have something for everyone. Test your mental aptitude and see just how clever you are with our challenging and fun collection of brainteasers."

The Water and Wine Puzzle-brain teaserhaa

16. Riddles
You have two glasses, one filled with water and the other filled with wine. You take a spoonful of water and pour it into the wine glass, then take a spoonful of the wine-water mixture and pour it back into the water glass. Is there more water in the wine or more wine in the water?

    • The amounts of water in the wine and wine in the water are the same. The process of mixing and exchanging liquids balances out the quantities.

The Escaping Prisoner-brain teaser

17. 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 Infinite Hotel-brain teaser

18. 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 Crossing Bridge-brain teaser

19. 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.

The Missing Dollar-Brain teaser

20. Riddles
Three friends check into a hotel room that costs $30. They each contribute $10 and pay the bill. Later, the hotel realizes they made a mistake and the room only costs $25. The bellboy is sent to return $5 to the friends. Unsure how to split the $5, the bellboy decides to give each friend $1 and keep $2 as a tip. Now, each friend has paid $9 (totaling $27), and the bellboy kept $2, which sums up to $29. Where is the missing dollar?

    • There is no missing dollar. The mistake lies in the way the total is calculated. The $27 already includes the $2 that the bellboy took. So, $25 went to the hotel, and $2 went to the bellboy.

The Magic Number

21. Riddles
Pick any number. Double it. Add 9. Subtract 3. Divide by 2. Subtract the original number. What number are you left with?

    • The number is always 3, regardless of the original number you picked.

The Unpredictable Elevator

22. 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 Hourglass in a Box

23. 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 and a photograph-Brain Teasers

24. Riddles
A man is looking at a photograph of someone. His friend asks who it is. The man replies, Brothers and sisters, I have none. But that man's father is my father's son. Who was in the photograph?
    • Answer: His son.

Job polish and herb-Brain Teasers

25. Riddles
What is special about these words: job, polish, herb?
    • Answer: They are pronounced differently when the first letter is capitalized.

The Poisoned Wine-Brain teaser

26. 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.

Four cars and-Four Way- Brain Teasers

30. Riddles
Four cars come to a four-way stop, all coming from a different direction. They can't decide who got there first, so they all go forward at the same time. They do not crash into each other, but all four cars go. How is this possible?
    • Answer: They all made right-hand turns