Lesson: Assumption Questions

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Hey! Is C the answer for the first 500 to 650 question (utility companies presupposes..)?
gmat-admin's picture

You're referring to http://gmatclub.com/forum/in-response-to-the-increasing-cost-of-producin...
Yes, the correct answer is C.
Just click on the "Reveal Spoiler" link to view the correct answer.

Hi Bret,

Thank you! I dont see your detailed answer for the above question. Thank you for your help in advance.
All the best
gmat-admin's picture


Totally lost with the third 650-800 question? No convincing answers on the gmatclub.

gmat-admin's picture

Hey! I just answered that question: http://gmatclub.com/forum/the-average-hourly-wage-of-television-assemble...


Hi Brent,

Can you please provide your clear cut analysis on all the 650+ questions in the respective forums.There is no expert analysis for these questions.

gmat-admin's picture

I'll see what I can do!

Hi Brent,

Thank you for these amazing lessons.

I still have difficulties with 650-800 questions. I would like to practice more. Grateful if you could advise where I can find practice question of this type.

Thanks a lot

gmat-admin's picture

GMAT Club has a searchable database (here: https://gmatclub.com/forum/search.php?view=search_tags) with thousands of official questions.

Hi Brent,

In Assumption CR Q's, how do i eliminate the answers to get the write answer?
I've tried everything from negation to elimination by writing the conclusion and premise down to find the right assumption.

Please help me! I seem to get most CR question's wrong.
gmat-admin's picture

Hi shefali,

It sounds like you have the correct strategies, so it's hard to say what the issue is.

You might want to take your time reviewing multiple responses to each question to get a better feel for this question type.

I hope that helps.

lol, I'm assuming that i don't die before i take my GMAT exam next month.
gmat-admin's picture

Ha, that is definitely an important assumption. Now let's see what happens when we apply the negation technique to this assumption .... :-)

Hi Brent- can you explain meaning of choice "C", my understanding is that it says children having allergic reaction are not sent to nurse, if this is case then how is it right ans?

gmat-admin's picture

Question link: https://gmatclub.com/forum/exposure-to-certain-chemicals-commonly-used-i...

The passage tells us that more kids exposed to the chemicals are being sent to the school nurses

The conclusion is that EITHER Renston's schoolchildren have been exposed to greater quantities of the chemicals OR the children are more sensitive to them than schoolchildren were ten years ago.

In other words, the author is saying that there are only two possible things CAUSING the increase of kids sent to the nurse:

#1) the kids are getting exposed to greater quantities of the chemicals

#2) the kids are becoming more sensitive to the chemicals

When we NEGATE answer choice C, we get:

Children who have allergic reactions to the chemicals ARE more likely to be sent to a school nurse now than they were ten years ago.

This negated answer choice DESTROYS the argument, since it says that the CAUSE of the increased nurse visits is something OTHER THAN #1 or #2.

Does that help?


Hi Brent, what would be the answer here. Everyone is eliminating E, but I feel its the only one that targets the reduction in "number of truckloads".


gmat-admin's picture

The city (by recycling) hopes to reduce the number of truckloads of refuse TO BE INCINERATED to half of last year's number. This, in turn, will decrease the amount of ash generated this year to half of last year's amount.

Answer choice E does not specifically talk about the number of truckloads of refuse TO BE INCINERATED; it talks about the TOTAL quantity of refuse collected.

The TOTAL quantity of refuse collected = (quantity of recyclable refuse) + (quantity of refuse TO BE INCINERATED)

When we NEGATE E, we get: The TOTAL quantity of refuse collected by Shelbyville city services this year WILL BE greater than that collected last year.

This negated premise does not destroy the original conclusion, because more total refuse does not necessarily mean more refuse to be incinerated. The total amount of refuse might be 99% recyclables, in which case, the city will still meet its goal of halving the quantity of ash generated.

Now let's NEGATE answer choice D (the correct answer).

We get: The refuse incinerated this year will generate MORE residual ash per truckload incinerated than did the refuse incinerated last year.

So, a 50% reduction in the quantity of refuse TO BE INCINERATED will not translate into a 50% reduction in the quantity of ash.
This negated premise DESTROYS the conclusion. So, D must be correct.

Dear Brent,
When you say identify and summarise the conclusion / premises, do you mean we do so mentally or to jot it down in our pad?
gmat-admin's picture

Good question.

If you can create super concise summaries, then I think the process of writing them on your scratch paper can be very beneficial.

That said, you might want to experiment to see whether jotting them down helps.


Hi Brent!,

Regarding question 550 (2018 official guide), what do you think about the given explanation in answer B). That means that if in any other question a ranking is mentioned as an explanation, we should distrust it?

Thanks in advance for your help!
gmat-admin's picture

Question link: https://gmatclub.com/forum/political-theorist-even-with-the-best-spies-a...

When we read answer choice B, the part that says "leaders whose foreign policy decisions have been highly RANKED..." should stand out.
Why not just say "leaders whose foreign policy decisions ARE good..."?
The addition of this "ranked" proviso makes this answer choice considerably weaker.

Also, answer choice B does not address the part about making decisions when "information is incomplete," whereas answer choice E DOES address that.

For these reasons, I think E is a little better than B.

YOUR QUESTION: If, in any other question, a ranking is mentioned as an explanation, we should distrust it?

Although I'm reluctant to provide a sweeping rule/guideline, I can say that I've seen CR passages in which the author cites an authority (like a study or a scholar) as the major reason for drawing a particular conclusion. In these cases, we should definitely be wary of this argumentative strategy.

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