When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What does this rebus means ?

PROG WORKRESS

Can you find the six hidden animals in the picture below?

I’m tall when I’m young, and I’m short when I’m old. What am I?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?