Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

Can you find the key in the picture below?

Which point will the car reach to go out?

Why is 6 afraid of 7?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

What begins with T, ends with T, and has T in it?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?