When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What kind of band never plays music?

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?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

You need to arrange three 7 and mathematical symbols to form number 1?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Remove two matchsticks to make the below equation correct.