Because its hard for me so I am posting it here
The sum of three number is 12.Of them the sum of two number is 13.If the 3rd number is a natural number then what is it?
I have found it in Bigganchinta November 2017.Please help me to solve it.
A strange NUMBER THEORY Problem

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Re: A strange NUMBER THEORY Problem
The $3rd$ number begets an answer of $1$ which isn't a natural number.
Re: A strange NUMBER THEORY Problem
But I have found it in Bigganchinta November 2017. You cannot tell that the question is wrong!
 ahmedittihad
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 samiul_samin
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Re: A strange NUMBER THEORY Problem
I also think the question is not right.