To assume is to.....

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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To assume is to.....

by jnorton1547 » Mon Feb 18, 2013 7:05 pm
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.
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by Jim@StratusPrep » Thu Feb 21, 2013 10:36 am
Sometimes yes and sometimes no means maybe.

Maybe means insufficient.

Don't complicate your thoughts.
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by jnorton1547 » Thu Feb 21, 2013 5:15 pm
Thanks for your response. I do understand the concept of sometimes vs always. My question was more about the interpretation of the second statement (though I can see where I may have confused you with my comment about the answer to my question being "sometimes yes and sometimes no").

If Charles WOULD weigh less than Dianne IF he lost 20lbs, does that mean he currently weighs MORE?

There are times the GMAT asks us to make assumptions, and then there are times where we are supposed to take it at face value. In this case, I made the assumption that what the GMAT was telling me was that Charles DOES currently weigh more than Dianne because he WOULD ONLY weigh less if he LOST 20 lbs.

How do I know when the GMAT wants me to read a question/statement that way, and when it doesnt?

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by Jim@StratusPrep » Fri Feb 22, 2013 6:12 am
No, you are reading too far. Even if he currently weighs less, he would still weigh less after losing 20 pounds.
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by jnorton1547 » Fri Feb 22, 2013 7:32 pm
Thanks. I'm interpreting your "no" to mean that I shouldn't make ANY assumptions in the quant section at all. I was using this question as a platform to ask about assumption on the quant section. Again, I don't have trouble understanding the explanation - I get that I wasn't supposed to make the assumption about Charles's current weight - but my concern is then taking this "do not assume anything" approach forward to a question which may perhaps ask that I DO make an assumption. If this is the case, then the guidance I'm looking for is how to distinguish between the questions where I'm supposed to make assumptions, and the questions I'm supposed to take at face value.

If the answer is "do not make any assumptions", I'm sorry to have belabored the point, particularly in the context of such an easy question, but I'm just trying to establish the mindset for quant.

Thanks for having seen this through so far.