Let's Check Your IQ

Guess what comes next in the sequence:

1 2 3 4 5 ? 

The answer is not 6. What is the answer?

I have 4 corners. I have 4 sides.

All of my sides are the same length.

Who I am?

Think of a number

Step 1: Multiply it by 3

Step 2: Add 6

Step 3: Divide by 3

Step 4: Subtract the number chosen in step one from the answer in step 4.

What is the answer?

What goes up but never comes down?

What am I?