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

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?

Replace the question mark with the correct number below.

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

How many triangles can you count in the figure given?

What is full of holes but still holds water?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.