Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Prove that the below maths equation is true.

8 + 8 = 91

What is the longest word in the dictionary?

Can you solve the below tricky visual equation?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Can you find the missing piece of the Porsche?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

How can one talk without saying a single word?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____