What is the next number in this series?

4,12,84,3612....

Which is Odd One Out and why?

4377

3954

9862

8454

9831

Solve the mathematical equation in the picture below.

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

I have an eye but still cannot see.

Who am I?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

Can you Find and name the hidden bird in the picture below ?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Replace the question mark with the number below given a simple math problem.