The more of this there is, the less you see. What is it?

Can you write down eight eights so that they add up to one thousand?

How many times can you subtract the number two from the number fifty?

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?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

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?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

John had a bag containing colourful marbles. The colours are red, green and blue. The total number of marbles he had in his bag was 60. There are 4 times as many red marbles as green marbles. 6 more blue marbles than green marbles. How many marbles of each colour did John have?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What has many keys but can’t open a single lock?