Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

How can one talk without saying a single word?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

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?