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

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

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?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

What has one letter and starts with an E?