I look at you, you look at me, I raise my right, you raise your left. What am I?

What is the next number in this matchsticks series riddle?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What does this rebus puzzle means ?

Can you count the number of squares in the figure below?

The cream is heavier than Milk. True or False?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who 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?