If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you make a fire with just a single stick?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Can you find out the missing number in the grid?

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?

Which wheel of car does not rotate when you turn your car right?

You need to remove two matchsticks to make the below equation true. Can you do it ?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?