Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

What is the Surname of Barbie Doll?

Why 1729 is a magic number? Answer Logically.

How many times can you subtract the number 5 from 25?

I am white when I am dirty, and black when I am clean. What am I?

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

I am the fastest animal but cannot climb the tree. What am I?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?