What do you answer even though it never asks you questions?

No matter how little or how much you use me, you change me every month. What am I?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

What is the Surname of Barbie Doll?

Identify the hidden meaning behind this picture?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

Can you find a five letter word that is left with only two letters if one is removed?