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

Replace the question mark with the correct number.

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

I know a nine-letter word having only one vowel.
Do you ?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

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

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?