Partial Information
There are 2011 people in the group, where an unknown number of people are male and female. Person A engages in a conversation with you. You know that there are between 500 and 700 males at the party, exclusive. A knows that too, but he also knows some additional information that you don't know.
The conversation:
A: That guy's over there is wearing a purple shirt.
You: Yeah, he's a mathematician studying perfect squares.
A: By the way, the total number of females can be expressed as a sum of 3 squares.
You: Nice! But I still don't know how many males and females there are.
A: See that guy over there wearing a bandana? His name's Jack. I think he can tell you the number!
(You walk over to Jack)
Jack: The number of females is either odd, a triangular, or a fibonacci number.
You: I still don't know.
Jack: The number of males is the shape of my moustache.
You: (Stares at moustache) Thanks a lot!!! I've figured out the number of males and females!
If the ratio of number of males to females can be expressed as a/b, where a and b are positive coprime integers, then what is a+b?
The answer is 2011.
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1 solution
Since the total number of people are prime, a and b will always be Coprime. So no simplification of the final fraction is necessary, and a+b is the number of males + number of females, which is 2011.