A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

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

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?

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

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

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

How many letters are in the alphabet?

How many letters are in the alphabet?