What is the next number in this matchsticks series riddle?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

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

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

It is always ahead of me yet I can never see it. What is it?

The centre of the third figure is empty. What digit should fit inside?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

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?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?