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Intern
Joined: 20 Nov 2017
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Location: India
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28 Jul 2018, 17:30
Hi All,

I came across the below OG questions and found differences in the OG explanation which I am unable to comprehend.

OQ1: Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

OE1: There is an illogical comparison between prices at the producer level and a time period (a year ago)

OQ2: Heating-oil prices are expected to be higher this year than last because refiners are paying about \$5 a barrel more for crude oil than they were last year.

OE2: There is a comparison between this year's and last year's heating-oil prices.

Aren't both the explanations contradicting? What am I missing here?

Experts mikemcgarry, egmat , GMATNinja, KarishmaB, sayantanc2k, daagh, chetan2u
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 8659
Location: Pune, India

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28 Jul 2018, 23:41
KarthikvsGMAT wrote:
Hi All,

I came across the below OG questions and found differences in the OG explanation which I am unable to comprehend.

OQ1: Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

OE1: There is an illogical comparison between prices at the producer level and a time period (a year ago)

OQ2: Heating-oil prices are expected to be higher this year than last because refiners are paying about \$5 a barrel more for crude oil than they were last year.

OE2: There is a comparison between this year's and last year's heating-oil prices.

Aren't both the explanations contradicting? What am I missing here?

Experts mikemcgarry, egmat , GMATNinja, KarishmaB, sayantanc2k, daagh, chetan2u

In question 1, the comparison is between prices and a time period. This is incorrect.

Question 2 option (A) is elliptical.
The missing words could very well be
... prices are expected to be higher this year than last [year's prices].
_________________

[b]Karishma
Veritas Prep GMAT Instructor

Math Expert
Joined: 02 Aug 2009
Posts: 7099

### Show Tags

29 Jul 2018, 06:36
KarthikvsGMAT wrote:
Hi All,

I came across the below OG questions and found differences in the OG explanation which I am unable to comprehend.

OQ1: Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

OE1: There is an illogical comparison between prices at the producer level and a time period (a year ago)

OQ2: Heating-oil prices are expected to be higher this year than last because refiners are paying about \$5 a barrel more for crude oil than they were last year.

OE2: There is a comparison between this year's and last year's heating-oil prices.

Aren't both the explanations contradicting? What am I missing here?

Experts mikemcgarry, egmat , GMATNinja, KarishmaB, sayantanc2k, daagh, chetan2u

Karthik, I do not think there is anything wrong in the first part. It follows almost the same structure as the second sentence.
Having said that there must be some other errors in sentence 1 that make it wrong. And it is widely believed that although you can never doubt the answer but the explanations are not the best always.

If you are talking of ellipsis it can be done to both..

OQ1: Prices at the producer level are only 1.3 percent higher now than - the prices at the producer level - a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.
So nothing wrong here too. The choice is wrong basically for other reasons
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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30 Jul 2018, 12:10
1
KarthikvsGMAT wrote:
Hi All,

I came across the below OG questions and found differences in the OG explanation which I am unable to comprehend.

OQ1: Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

OE1: There is an illogical comparison between prices at the producer level and a time period (a year ago)

OQ2: Heating-oil prices are expected to be higher this year than last because refiners are paying about \$5 a barrel more for crude oil than they were last year.

OE2: There is a comparison between this year's and last year's heating-oil prices.

Aren't both the explanations contradicting? What am I missing here?

In my opinion, you're correct. We noticed this at MPrep a while ago and had a discussion about it - I don't think we ever came to a satisfying conclusion, except for 'sometimes the official explanations are misleading.'

In general, if you see something like this ('prices are 1.3 percent higher now than a year ago') in an official problem, look at the other issues first and eliminate whatever you can. If you end up with two answer choices that both seem otherwise correct, but one says 'a year ago' and the other says 'the prices from a year ago', go with the one that spells it out more clearly. But there will most likely be another, clearer issue to work with first.
_________________

Chelsey Cooley | Manhattan Prep | Seattle and Online

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VP
Joined: 27 Mar 2010
Posts: 1028
Location: Bangalore, India

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03 Aug 2018, 10:30
KarthikvsGMAT wrote:
Hi All,

I came across the below OG questions and found differences in the OG explanation which I am unable to comprehend.

OQ1: Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the south are hurting crops and therefore raised corn and soybean prices.

OE1: There is an illogical comparison between prices at the producer level and a time period (a year ago)

OQ2: Heating-oil prices are expected to be higher this year than last because refiners are paying about \$5 a barrel more for crude oil than they were last year.

OE2: There is a comparison between this year's and last year's heating-oil prices.

Aren't both the explanations contradicting? What am I missing here?

Hi Karthik, as others have correctly pointed out, there is nothing wrong in either of these sentences from a comparisons perspective; however, the official explanations are sometimes less than ideal.

In OQ1, the real problem is: .....in the south are hurting crops and therefore raised..... Hurting is not parallel to raised.

An officially correct sentence:

The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970’s.

Again, this is a correct sentence from a comparison perspective.

It would be wrong to consider that its numbers is being incorrectly compared with when the use of DDT was sharply restricted in the early 1970’s.

The way to read this is:

The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than (its numbers were) when the use of DDT was sharply restricted in the early 1970’s.

p.s. Our book EducationAisle Sentence Correction Nirvana discusses these concepts of comparison, their application and examples in significant detail. If someone is interested, PM me your email-id; I can mail the corresponding section.
_________________

Thanks,
Ashish
EducationAisle, Bangalore

Sentence Correction Nirvana available on Amazon.in and Flipkart

Now! Preview the entire Grammar Section of Sentence Correction Nirvana at pothi.com

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