So I'm not 100% confident that I'm posting this in the right area, but I've come across it in the math section so, it's gonna be here for the time being...

Just ran into the following data sufficiency question:


Does Charles weight more than Dianne?
1) Either Charles or Dianne weighs 130lbs, but not both.
2) If Charles lost 20 lbs, he would weigh less than Dianne

For me, it's one of those questions where I sit back and ask, "does the GMAT want me to assume anything here?"

I feel like sometimes the answer to that question is "yes", and sometimes it is "no".

In this case, the assumption I was trying to validate was whether the second statement, by saying that he WOULD weigh less than Dianne, meant that he currently weighs more than Dianne. I chose "yes" simply because there was really nothing else to go on other than the wording, and I felt like it was enough to convince me that it wouldn't have otherwise been said.

Answer was "no" - at least to the question about whether I should assume anything.

This is one of those questions that should mean easy points, but I lose track of some of the things we are supposed to assume.

Is there someone that maybe has some guidance on these kinds of things?

Thanks.