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?

Replace the question mark with the correct number.

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

Why do people go to bed?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Using Only Five 5's and any mathematical operator make sum as 37

A man dies of old age on his 25 birthday. How is this possible?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?