What has hands, but can’t clap?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

How can a man go eight days without sleep?

why number 8549176320 is one of a kind?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

What demands an answer, but asks no questions

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

Count the number of triangles in the picture below:

Make a sentence consisting of three words that have the whole alphabet.