A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What is both possible and impossible at the same time?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???