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

Take away the whole and some still remain. What is it?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Find the hidden panda in the image below.

What is the next number in this series?

4,12,84,3612....

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

What is harder to catch the faster you run?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

The answer I give is yes, but what I mean is no. What was the question?

With the help clues provided in the image, can you find the 5 digit key?