There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What has no start, end, or centre?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

I am an odd number. Take away a letter and I become even. What number am I?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

I know a nine-letter word having only one vowel.
Do you ?

How many triangles are there in the picture below?

Make a sentence consisting of three words that have the whole alphabet.