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

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Rearrange the letters in "new door" to make one word.

What does this simple rebus mean?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

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?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?