Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What Adam and Eve do not have but the rest of the people have?

I travel all around the world but always stay in the corner. What am I?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?