What has no start, end, or centre?

Imagine you are in a room with no windows or doors. How will you get out?

Which is the rope you never skip with?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Find the last number in the series below:

voN luJ yaM raM ---

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

Can you count the number of matches in the picture below ?

I cannot talk, but I always reply when spoken to. What am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?