What is the next number in this series?

4,12,84,3612....

Move three sticks of the spiral below to form a square.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

How is the moon similar to a dollar?

Can you replace the question mark with the correct number?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Using Only Five 5's and any mathematical operator make sum as 37