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

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

If you say my name, I will no longer exist. What am I?

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

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What is the Surname of Barbie Doll?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?