What is black when you buy it, red when you use it, and gray when you throw it away?

I shave every day, but my beard stays the same. What am I?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

There are forty elephants and they have forty-fore heads. How can this be possible?

What building has the most stories?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

Move four matchsticks to the below square to form three squares?

What is next number in the pattern below:

131 517 192 123 ?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?