What does below rebus means ?

Count the number of triangles in the below picture?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

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

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

You are a thief and you are being punished for your crime. People have tied your head down on a tree with a rope that has been anchored in the ground. A candle is burning below the rope which is slowly burning it away. Just below your head, a Lion has been left loose and is waiting for you to drop down on the ground so he can have you as his lunch.

You have to survive the scenario. How will you do it?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?