Move four matchsticks to the below square to form three squares?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Can you count the number of triangles in the given figure?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What does the below mathematical rebus mean?

Can you find out the total number of triangles in the given figure?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.