You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

A man is sitting in a bar when a rich man sits next to him. He turns to the rich man and says, “Did you know I know almost every song that has ever existed?”

The rich man laughs. The man then says, “I bet you all the money you have in your wallet that I can sing a genuine song with a lady’s name of your choice in it. The rich man laughs again and says, “OK, how about my daughter’s name, Jamie Armstrong-Miller?” Minutes later, the man collects his cash and the rich man goes home cashless. What song did the man sing?

How is a fly different from a mosquito?

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?

How many letters are in the alphabet?

How many triangles are there in the picture below?

Count the number of triangles in the below picture?