40 brain teasers for adults to give your mind a workout

Get your mind ticking with these brain teasers.

Brain teasers

by Emily Thorpe |

Challenging yourself with puzzles and brain teasers is a great way of sharpening your mind, and it's been proven to help your brain health in the long run.

Research shows that mental exercise that tests your brain power can boost your brain's activity, reducing the risk of dementia, boredom and improve concentration and memory.

That's why we've gathered together 20 brain teasers for you to have a go at. Write the answers on a piece of paper then scroll down for the answers to see if you were correct.

1.

Brain teaser correct shadow

2.

Brain teaser 2

3.

Brain teaser 3

4.

A woman is born in 2020, but dies in 1995. How is this possible?

5.

Can you decide which is the correct definition for the word drouser (coined 2017)?

A. An item of clothing comprising a dress attached to a pair of trousers

B. An unsuccessful warm-up comedian

C. A depressing person; a dampener

6.

Upon taking his car to a hotel, a man immediately declares bankruptcy. What's the reasoning?

7.

How many squares are there?

How many squares are there

8.

A cowboy gallops into town on Monday, stays for two days, and leaves town on Monday. How is this possible?

9.

You need 7 gallons of water, but you only have two jugs with which to measure: a 5-gallon jug and a 3-gallon jug. How do you measure exactly 7 gallons?

10.

Which word logically comes next in this sequence? Spots, tops, pots, opts…

11.

What is the number of the parking spot containing the car?

car brain teaser
©Metaweb / CC-BY

12.

How much dirt is in a hole that measures 2 feet by 3 feet by 4 feet?

13.

number brain teaser

14.

How would you combine one-third of 12 and four-fifths of 7 to get 11?

15.

If I open the tap above tank A, Which tank is the first one to be filled completely?

gpuzzles.com

16.

Can you replace the question mark with a number?

brain teaser
©geniusbrainteasers.com

17.

Which word does not belong? Beekeeper, dumbbell, dumbstruck, untruthful.

18.

brain teaser

19.

Can you spot which two frogs are identical?

frog brain teaser
©brainturk.com/

20.

A man is trapped in a room with only two possible exits. Through the first door is a room with an enormous magnifying glass causing the blazing hot sun to instantly burn anything that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

21.

A doctor and a bus driver are both in love with the same woman, an attractive girl named Sarah. The bus driver had to go on a long bus trip that would last a week. Before he left, he gave Sarah seven apples. Why?

22.

Turn me on my side and I am everything. Cut me in half and I am nothing. What am I?

23.

What fastens two people yet touches only one?

24.

First, I threw away the outside and cooked the inside. Then I ate the outside and threw away the inside. What did I eat?

25.

You are a cyclist in a cross-country race. Just before the crossing finish line, you overtake the person in second place. In what place did you finish?

26.

What has a mouth, but cannot eat; moves, but has no legs; and has a bank, but cannot put money in it?

27.

When you have me, you immediately feel like sharing me. But, if you do share me, you do not have me.

28.

You’re in a dark room with a candle, a wood stove, and a gas lamp. You only have one match, so what do you light first?

29.

Until I am measured, I am not known. Yet you miss me, when I have flown. What am I?

30.

Find the missing number in the empty triangle.

triangles with numbers brain teaser

31.

For each number in the matrix below, decide whether it is a normal or reversed number (and don't rotate your head!).

rotated numbers brain teaser
©Sharpbrains.com

32.

Which bunny has no pair?

bunny brain teaser
©thedudolf.blogspot.com

33.

Can you spot the mouse?

spot the mouse brain teaser
©thedudolf.blogspot.com

34.

spot the mistake brain teaser
©playbuzz.com

35.

Find the penguin.

find the penguin brain teaser
©thedudolf.blogspot.com

36.

A cowboy arrives in town on Friday, stays for three days, and then leaves on Friday. How did he do it?

37.

I am an odd number. Take away a letter, and I become the same. What number am I?

38.

What is yours that other people use more than you?

39.

How many seconds are there in a year?

40.

I come down, but I never go up. What am I?

Answers

1.

Brain teaser correct shadow 2

2.

Bear C has a mirrored bow tie.

3.

Brain teaser 3 answer

4.

The woman was born in 2020 B.C.

5.

(A) an item of clothing comprising a dress attached to a pair of trousers

6.

He's playing Monopoly.

7.

8.

His horse's name is Monday.

9.

First, you fill the 5-gallon jug from the faucetYou then pour the contents of the 5-gallon jug into the 3-gallon jug until the 3-gallon jug is full. That leaves 2 gallons of water in the 5-gallon jug. Next, you dump out the 3-gallon jug and pour the 2 gallons of water from the 5-gallon jug into the empty 3-gallon jug. Finally, fill the 5-gallon jug from the faucet a second time; those 5 gallons plus the 2 gallons in the 3-gallon jug equals 7 gallons.

10.

Stop.

11.

  1. The parking spots are actually flipped upside down.

12.

None.

13.

brain teaser

14.

Add EL (one-third of TWELVE) to EVEN (four-fifths of SEVEN) and get ELEVEN.

15.

Tank F.

16.

210

17.

Dumbbell. All of the other words have only one of the vowels (a, e, i, o, u).

18.

Move a stick from the + to make a –. Then place it with the 6 to form an 8.

19.

B and E.

20.

Leave through the first door at night when the sun is down.

21.

An apple a day keeps the doctor away!

22.

The number 8.

23.

A wedding ring.

24.

Corn on the cob.

25.

Second Place. If you pass the person in second, you take second place, and they become third.

26.

River.

27.

A secret.

28.

The match.

29.

Time.

30.

31.

Row 1: normal, reversed, reversed

Row 2: normal, normal, reversed

Row 3: normal, reversed, reversed

32.

bunny brain teaser answer
©thedudolf.blogspot.com

33.

spot the mouse brain teaser answer
©thedudolf.blogspot.com

34.

spot the mistake brain teaser answer
©playbuzz.com

35.

Find the penguin.

find the penguin brain teaser answer
©thedudolf.blogspot.com

36.

His horse was Friday.

37.

Seven (remove the “s” and it becomes “even”).

38.

Your name.

39.

Twelve. Jan. 2nd, Feb. 2nd, March 2nd…

40.

Rain.

For more online puzzles and brain teasers, take a look at our sister site, Take a Break.

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