I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Which English verb becomes past tense just by rearranging the letters?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

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?