Why is a river so rich ?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

How can you take 2 from 5 and leave 4?

What is the riddle which can be asked all day with a different correct answer each time.

Which of the below owl is odd one out?

What does it mean?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?