Rearrange the letters in "new door" to make one word.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

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

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

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

I have feet, but no legs. Which animal Am I?

What is the fastest way to double your money?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?