They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

What kind of tree can you carry in your hand?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Look at the picture and find out which square is not linked with any of the other squares.

Give it food and it will live; give it water and it will die.

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Why is Saturday stronger than Monday?