John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

What is the next number in this matchsticks series riddle?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Prove that twice of ten is the same as twice of eleven.

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?