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

How can you leave a room with two legs and return with six legs?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Find the smallest sentence with all the English alphabet.

Can you count the number of triangles in the picture below?

Count the number of triangles in the picture below:

Can you make four (4) nines (9) equal 100?

What can you hold in your right hand, but never in your left hand?

How far can you walk into the woods?