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

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?

Which is the smallest number that you can write using all the vowels exactly once?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

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

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Can you count the number of blocks in the picture below?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?