Simple algebra

Algebra Level 1

A small wedding hall is full of guests. The owner of the hall is ordered to arrange the lunch that exactly meets the need of all the guests (neither more nor less). Unfortunately, the owner doesn't know the exact number of people present in the hall. So, in order to know the number of people, he uses a trick.

He moves to the announcement stage and says:

"I welcome to every one of the hundred people present in the hall"

One person responds back:

"We are not 100 here, in fact doubling the number of us and adding another half of the double then finally including you will make us 100"

How many People are there in the hall?


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