Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I know a nine-letter word having only one vowel.
Do you ?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

What does it mean?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?