If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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

What Word am I Looking For ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

I have an eye but still cannot see.

Who am I?

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?

Readers with the highest levels of visual skills can find three differences between the pictures of a cow on the farm in 14 seconds. Can you? Test your visual skills now!

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?