If Rajina's daughter is my daughter's mom, who am I to Rajina?

Find the missing letter in the last circle logically in the given below picture.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

You can hear me, but you can't touch or see me.

What am I?

Find the next number in the series below

21 32 54 87 131 ?

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

What is the next number in the series?

15 29 56 108 208 ?

A guy in his thirties is found dead in a forest. The shocking thing about the body is that he is wearing his swimming trunks snorkel and a facemask.

For your information, the nearest lake is some 10 miles away and the sea is hundreds of miles away.

How did he die then?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?