Why 1729 is a magic number? Answer Logically.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Prove that the below maths equation is true.

8 + 8 = 91

In the Wild West, you are challenged into a death match by two bounty hunters nicknamed Golden Revolver (GR) and Killer Boots (KB). You accept the challenge. None of you want to waste any of the bullet and so a certain rules are laid down:

1) All of you will shoot in a given order till the last man standing.
2) Each of you shoots only once upon his turn.
3) If any one of you is injured, the other two will finish him off with an iron rod.
4) The worst shooter of all (which is you) shoots first and the best one shoots at the last.

Now, how will you plan things if you know that you hit every third shot of yours, KB hits every second shot and GR hits every shot ?

What's the only room from which no one can enter or leave

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Which five letter word can be added at the end of below word to form a
valid word?

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What do you get if you add 2 to 100 four times?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?