Which tank will fill first?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Spot 5 differences in two Christmas tree below:

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What does this say?

XLR8

In the image given, you can find several triangles. Can you count them all?