What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Why is 6 afraid of 7?

What number should come in place of the question mark below?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Here is a Swiss Cross. You have to make two straight cuts in the figure so that it is divided into four congruent pieces. Also, you should be able to join these pieces into a square then. Can you accept this challenge?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

What seven-letter word has hundreds of letters in it?

What does does this rebus picture means ?