Can you solve this picture maths equation?

Identify the 10 differences between the two given pictures.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Next Number in the Series,

5, 16, 49, 104, ?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Can you find out who is the kidnapper in below Picture and why, Explain ?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

Replace the question mark in the picture below.

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?