What is black when you buy it, red when you use it, and gray when you throw it away?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

A pregnant woman is preparing to name her seventh child. Her children's names so far are Dominique, Regis, Michelle, Fawn, Sophie, and Lara. What will she name her next child -- Jessica, Katie, Abby or Tilly?

Which tank will fill first?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

What is the largest number you can write with just 3 digits?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?