A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

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

Before Mount Everest was discovered, what was the highest mountain in the world?

Find the next number in the sequence

5 12 24 36 ?

What kind of storm is always in a rush?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

What is the last thing you take off before bed?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?