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

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

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

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

What Deficiency does the below rebus represent?

VIT_MIN

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What does this below rebus puzzle mean?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day