Lost in Numbers

The door opened immediately after he answered the question, and he moved to the next room.

The voice said, "Next question, it's a multiplication. " He proudly said, "Multiplication is child's play for me; I'm excellent at it."

The question appeared on the wall: "12845983 multiplied by 2834794" with four options.

His jaw dropped.

“What kind of question is this? This is too big to even fit on your wall. How am I supposed to solve it?" Yushura yelled in anger.

The voice replied, "You have to do it."

He said, "Where will I do it? Upon your mouth? Give me something to solve it with."

A chalk fell from the roof, and he started solving on the walls. After a long time and effort, he got an answer that didn't match any of the options.

He shouted with frustration, "All these options are wrong!"
The voice said, "My options are correct; your answer is wrong. Do it again."

He made a weird face and started multiplying again. He got so exhausted, but finally, he got the answer and said, "Here's the answer, option B. Now let me go to the next room."

The door opened, and he moved to the next room, uttering, “ I hate maths.”

The voice said, “This is your last question. Let's see if you can make it or not.”

The question appeared: “If a number is multiplied by 11, then 13 is added to it, and 27 is subtracted from the result, and the remainder is divided by 9, and 92 is added to it, and then the whole is multiplied by 5, and 22 is subtracted from it, and the result is multiplied by 65, and 31 is subtracted from it, and then the whole is multiplied by 4, and 19 is subtracted from it, and the result is divided by 3, and 14 is added to it, and then the whole is multiplied by 2, and 25 is subtracted from it, and the result is divided by 6, and 10 is added to it, and finally the whole is multiplied by 0.”

Yushura yelled in anger, “You are really getting on my nerves. I will make sure you pay for it.”

“Don't waste your time, idiot,” the voice said.
“The four options are in the form of four doors; the right door will lead you to me,” the voice added.

He sat down and started solving the question step by step without reading it completely.

He solved it up to the second-last step, until he saw ‘multiplied by zero’.

“You asshole! You tricked me and wasted my time,” Yushura said in frustration.

He opened the door with zero written on it and saw the math teacher standing just in front of it.

“You are dumber than I thought,” said the teacher.

"Enough of your entertainment, now tell me who you are, and what your intentions are ?" Yushura asked.   

"You seem pretty interested in my story, huh! I was just an ordinary, boring maths teacher; my students didn't take me seriously, passed jokes on me, and never studied my topic. Their parents made complaints about me for not teaching them anything. I was just about to leave my job, but one day, I got possessed by  lord zevroth's blood, and then my life changed, now i made my students sincere and they are focused on my subject." the teacher said. 

"Well! enough about me , now it is the time to own your bangle after killing you , and it will be so easy for me , as you seem really exhausted.  huh! you stupid orange Watsukai." he added.