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

What word begins and ends with an E, but has only one letter?

The Little ant seems to be always confused. Do you know why?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

I can be cracked, made, told, and played. What am I?

Which word does the below Plexor means ?

what's the probability of getting a king or a queen from a pack of 52 cards?