Brain Teasers with Answers
These brain teasers with answers are 15 short logic puzzles and trick questions that look easy and are not. Every answer shows the working, so you can see where your gut went wrong.
15 questionsMixed (easy → hard)~3 minNo timer
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These brain teasers with answers are logic puzzles and trick questions that look simple and are not. Some are classic maths traps, like the bat and the ball or the lily pad that doubles every day. Others turn on a single word in the question, like the farmer whose sheep run away or the father with five daughters.
Read each brain teaser slowly, because the obvious answer is usually the wrong one. The questions go from quick warm-ups to a clock puzzle that catches most adults out. Every answer shows the working, so even when your gut lets you down you can see exactly where the trick was.
Use these brain teaser questions with answers as an icebreaker for a team meeting, a classroom starter or a family game night: read one aloud, give everyone ten seconds and then argue about it. Or play alone, check your score and challenge a friend to beat it. The full answer key is printed below the quiz.
Brain Teasers questions with answers
Show answers
A bat and ball cost ₹110. The bat costs ₹100 more than the ball. What does the ball cost?
- ₹5
- ₹10
- ₹1
- ₹15
Answer: ₹5. Ball ₹5, bat ₹105. Your gut said ₹10, but then the bat is only ₹90 more.
What letter comes next: O, T, T, F, F, S, S, …?
- S
- E
- N
- T
Answer: E. They are the first letters of One, Two, Three... so Eight comes next.
A rooster sits on the very top of a sloping barn roof and lays an egg. Which side does the egg roll down?
- The steeper side
- Neither: roosters don't lay eggs
- The side facing the wind
- It balances on the top
Answer: Neither: roosters don't lay eggs. Neither. A rooster is a male chicken, and only hens lay eggs.
You're running a race and overtake the person in second place. What position are you in now?
- First
- Second
- Third
- Last
Answer: Second. Second. You took their place, and the leader is still ahead of you.
Mary's father has five daughters: Nana, Nene, Nini and Nono. What is the fifth daughter's name?
- Mary
- Nana
- Nunu
- Nina
Answer: Mary. It's Mary's father, so Mary is the fifth daughter.
A farmer has 17 sheep. All but 9 run away. How many sheep are left?
- 9
- 8
- 17
- 0
Answer: 9. 'All but 9' ran away, so exactly 9 stayed behind.
A famous rabbit-breeding puzzle gives 1, 1, 2, 3, 5, 8… What comes next?
- 13
- 11
- 12
- 16
Answer: 13. Fibonacci: each number is the sum of the two before it, 5 + 8 = 13.
A lily patch doubles daily and covers the lake on day 48. When was it half covered?
- Day 24
- Day 47
- Day 36
- Day 12
Answer: Day 47. It doubles every day, so the day before full it was half.
An electric train is heading north at 100 km/h, and a strong wind is blowing from the west. Which way does its smoke blow?
- East
- South
- North-east
- There is no smoke
Answer: There is no smoke. There is no smoke. An electric train burns no fuel, so the wind has nothing to carry.
A clock shows exactly 3:15. What is the angle between the hour and minute hands?
- 22.5 degrees
- 0 degrees
- 15 degrees
- 7.5 degrees
Answer: 7.5 degrees. The minute hand is on 3, but the hour hand has moved a quarter of the way to 4: 30 ÷ 4 = 7.5 degrees.
A plane crashes exactly on the border between India and Nepal. In which country do they bury the survivors?
- India
- Nepal
- Nowhere: you don't bury survivors
- In whichever country the plane landed
Answer: Nowhere: you don't bury survivors. Nowhere. Survivors are alive, so nobody buries them. Most people start working out the border and miss the word.
How many animals of each kind did Moses take onto the ark?
- One
- Two
- Seven
- None: it was Noah's ark
Answer: None: it was Noah's ark. None. In the story it was Noah who built the ark. Most people answer "two" because the question sounds familiar enough to skip the name.
Two fathers and two sons go fishing. Each of them catches one fish, yet they bring home only three. How?
- One fish got away
- One of them ate a fish
- They are a grandfather, his son and his grandson
- One son is a stepson
Answer: They are a grandfather, his son and his grandson. There are only three people: the grandfather and the father are the two fathers, and the father and his son are the two sons.
When I was 6, my sister was half my age. Now I am 70. How old is my sister?
- 35
- 64
- 67
- 73
Answer: 67. 67. She was 3 when you were 6, so she is always 3 years younger.
A brick weighs 1 kg plus half a brick. How much does the whole brick weigh?
- 1.5 kg
- 1 kg
- 3 kg
- 2 kg
Answer: 2 kg. 2 kg. If half a brick plus 1 kg makes a whole brick, the other half must weigh 1 kg.
Frequently asked questions
Where can I find brain teasers with answers?
On this page. Play the quiz to see each answer with its working, or open the answer key below to read all 15 brain teasers with answers at once.
Are these brain teaser questions hard?
Most are easy once you see the trick, but they are built to catch your first instinct. The bat-and-ball question and the clock puzzle fool a lot of adults.
How many brain teasers are in this quiz?
There are 15 brain teasers, each a multiple-choice question with one right answer. Most people finish in about five minutes.
Can I play these brain teasers online for free without signing up?
Yes. They are free to play with no account or login. Press Start, answer all 15 and your score appears at the end.