There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Prove that the below maths equation is true.

8 + 8 = 91

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

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

which number am I?

Can you count the number of lines in the below picture?

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

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Complete the table series riddle by finding the number that can replace "??".