Story of Mathematic Teacher

The story of mathematic teacher sometimes make me feel amused because if you are already study of mathematical calculation you will said how come.

When the teacher already given the Math class then there are any conversation between student and teacher, their conversation like this:

Teacher: "Ali can you calculate the sum of 5 + 5"
Ali:        "5 + 5 sir? it's must be 8 sir!"
Teacher: "No Ali you are wrong it is 10"
Ali:        "OK, Sir but I still don't understand."
Teacher: "OK, you can try again Ali, how about what the sum of 7 + 8?"
Ali:         "7 + 8 must be 13 Sir!"
Teacher: "Wrong again Ali, 7 + 8 equal with 15 Ali!"

The teacher don't understand what's wrong with Ali why he still don't understand the calculation. Then the teacher ask again to Ali, because He look like confusing.

Teacher: "Ali, What are you thinking about?"
Ali:         "I confused Sir!"
Teacher: "What make you confused Ali?"
Ali:         "Yesterday you said, 6 + 4 is 10, and now you said 5 + 5 also 10, in other time you said 10 + 5 is 15 and now you said 7 + 8 also 15, actually what is the right one?"
Teacher: ???????

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