What goes up but never comes down?

What does the below mathematical rebus mean?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white 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?

Find the hidden panda in the image below.

Count the number of squares in the picture below.

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?