What has a ring but no finger?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

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

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

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

I always drive my customer away.

Who am I?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

Which flower has two lips?

I don't get anymore wetter, no matter how much rain falls on me.