In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

What do you see in the image below

Can you count the number of triangles inside a triangle?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

What building has the most stories?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?