A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?
What is the largest number you can write with just 3 digits?
A donkey is behind another donkey I'm behind that second donkey But there is a whole nation behind me It is a murder you can describe in a word.
If 21x = 79x, what is the value of x?
What can you serve, but never eat?
What is the relationship between these matchstick pictures below?
A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?
Find The Next Number in the series: 12 13 15 17 111 113 117 119 123 ?
Can you spot the man between the coffee bean in the picture below ?
What is always in front of you but can’t be seen?
How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?
The inventor of the Rubik’s Cube didn’t realize he’d built a puzzle until he scrambled it the first time and tried to restore it.
