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?

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

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

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

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?