That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Which alphabet letter is a question?

If 21x = 79x, what is the value of x?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Can you find the missing piece of the Porsche?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

I have branches, but no fruit, trunk or leaves. What am I?

The centre of the third figure is empty. What digit should fit inside?

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?

In a classic wine shop, the list of three most popular wines are:
- The cost of 1 French wine bottle: 500$
- The cost of 1 German wine bottle: 100$
- The cost of 20 Dutch wine bottles: 100$

John entered the wine shop and he needs to buy
- All three types of wine bottles.
- Needs to buy Dutch wine bottles in multiples of 20.
- Need to buy 100 wine bottles in total.

John has only 10000$. How many wine bottles of each type, John must buy?