One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What always comes into a house through the keyhole?

Considering the below equation:

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

Then, I + II + III = ?

Find the next number in the series

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

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What has one letter and starts with an E?

What Time Should the last watch show in the below figure?

What is the word or phrase below?
R | E | A | D