What has no start, end, or centre?

Which five letter word can be added at the end of below word to form a
valid word?

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What does this rebus riddle mean?

Prove that twice of ten is the same as twice of eleven.

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?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

My thunder comes before lightning.
My lightning comes before my rain.
My rain dries up all the land it touches.

Who am I?

Can you solve the photo plexer logic ?

Can you tell a 3D object that has just two surfaces?