Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

They are three errirs in this question. Can you find them?

Can you find out the total number of triangles in the given figure?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

If two's company, and three's a crowd, then whats four and five ?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What kind of band never plays music?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.