What is the next number in this series? 4,12,84,3612....
What is the largest number you can write with just 3 digits?
Solve the rebus riddle in the picture below.
The first box has two white balls. The second box has two black balls. The third box has a white and a black ball. Boxes are labeled but all labels are wrong! You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball. How many such operations are necessary to correctly label the boxes?
What are the 50th, 63rd and 100th numbers in the sequence below? 4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...
Replace the question mark with the number below given a simple math problem.
If an electric train is travelling south, then which way is the smoke going?
You are in a room with no metal objects except for two iron rods. Only one of them is a magnet. How can you identify which one is a magnet?
If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?
You can see it everyday, But cannot touch it at will. What is it?
What is black when you buy it, red when you use it, and gray when you throw it away?
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.
