I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What kind of band never plays music?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

O_er_t_o_

Complete the missing letters of the given word.

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you find the missing piece of the Porsche?

What is next number in the pattern below:

131 517 192 123 ?

Count the number of squares in the picture below.

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?