Last visit was: 12 Jul 2025, 03:41 It is currently 12 Jul 2025, 03:41
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 11 Jul 2025
Posts: 102,636
Own Kudos:
Given Kudos: 98,172
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,636
Kudos: 740,612
 [205]
14
Kudos
Add Kudos
188
Bookmarks
Bookmark this Post
Most Helpful Reply
avatar
kitipriyanka
Joined: 26 Jan 2016
Last visit: 25 Nov 2019
Posts: 100
Own Kudos:
154
 [24]
Given Kudos: 61
Posts: 100
Kudos: 154
 [24]
19
Kudos
Add Kudos
5
Bookmarks
Bookmark this Post
User avatar
Arro44
Joined: 04 Jun 2018
Last visit: 14 Aug 2022
Posts: 660
Own Kudos:
746
 [12]
Given Kudos: 362
Location: United States
Concentration: General Management, Finance
GMAT 1: 730 Q47 V44
GPA: 3.4
Products:
GMAT 1: 730 Q47 V44
Posts: 660
Kudos: 746
 [12]
8
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
General Discussion
User avatar
Bombsante
Joined: 03 Oct 2012
Last visit: 24 Mar 2023
Posts: 117
Own Kudos:
314
 [7]
Given Kudos: 41
Location: India
Concentration: Entrepreneurship, Strategy
WE:Brand Management (Pharmaceuticals and Biotech)
Posts: 117
Kudos: 314
 [7]
4
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
Statisticians studying the health effect of uranium mining on Navajo communities have found other besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

The sentence has two independent clauses separated correctly. We have a list of problems that occur in underlined part. This list has to be parallel and logical.

(A) children's cancer, and altered birth ratios of males and females are much higher (children's cancer, and altered birth ratios of males and females, Possessive noun and non-possessive noun - incorrect.)
(B) cancer among children, and altered male and female ratios at birth are much higher (altered male and female ratios at birth? Male:Female are not altered at birth, their birth ratios are altered. Incorrect)
(C) cancer among children, and altered birth ratios of males and females occur much more frequently (Correct)
(D) altered birth ratios of males and females, and children's cancer are much higher (same error as in A)
(E) altered male and female ratios at birth, and cancer among children occur much more (same error as in B)
User avatar
gmatt1476
Joined: 04 Sep 2017
Last visit: 27 Mar 2025
Posts: 334
Own Kudos:
24,239
 [7]
Given Kudos: 62
Posts: 334
Kudos: 24,239
 [7]
5
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
Bunuel
Statisticians studying the health effect of uranium mining on Navajo communities have found other besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
(B) cancer among children, and altered male and female ratios at birth are much higher
(C) cancer among children, and altered birth ratios of males and females occur much more frequently
(D) altered birth ratios of males and females, and children's cancer are much higher
(E) altered male and female ratios at birth, and cancer among children occur much more


SC98561.01

Official Explanation

Diction; Logical predication

Statisticians have been studying the frequencies of various health outcomes in uranium mining areas in Navajo communities. They have found that certain kinds of bad outcomes occur much more frequently in mining communities than in non-mining communities.

We need to pick the answer choice that best expresses this finding. The use of the predicate higher is appropriate when applied to rates of illness. However, it is not appropriate when applied to medical conditions (except as an informal shorthand), e.g., a claim that birth defects . . . are much higher. That is, it is unclear what a higher birth defect might specify.

The meaning of altered male and female ratios is unclear, as opposed to altered birth ratios of males and females.

A. In this choice, the statement altered birth ratios . . . are much higher is unclear.

B. In this choice, the statement altered . . . ratios at birth are much higher is unclear.

C. Correct. The idea of the sentence is expressed clearly and the phrase occur much more frequently clearly specifies altered birth ratios.

D. In this choice, it is unclear what is higher: it could be birth ratios of males and females, children's cancer, or both.

E. In this choice, the modifier at birth implies, nonsensically, that the ratios were altered at the time of birth. Furthermore, male and female ratios implies that the ratios themselves are of male or female gender.

The correct answer is C.
User avatar
soumya170293
Joined: 29 Jan 2015
Last visit: 05 Jan 2022
Posts: 72
Own Kudos:
113
 [1]
Given Kudos: 459
Location: India
Concentration: Marketing, Entrepreneurship
GPA: 4
WE:Information Technology (Internet and New Media)
Posts: 72
Kudos: 113
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Really 've taken too much time to solve it ( 3.18 sec ) and then made it wrong eventually like I always do whenever I take too much ..T.. :-D
was in a bit of quandary for choosing the correct option among...
cancer among children sounds good compared to children's cancer
altered birth ratios of males and females sounds better than altered male and female ratios at birth,
but for option C everything seems okay and even better than others by using occur but Does it sound good by using Double superlative much more frequently ?

Please clarify about this for option C ?
avatar
LPaliwal
Joined: 02 Jul 2018
Last visit: 23 Dec 2019
Posts: 1
Own Kudos:
2
 [2]
Given Kudos: 135
Posts: 1
Kudos: 2
 [2]
1
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
Statisticians studying the health effect of uranium mining on Navajo communities have found other besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
(B) cancer among children, and altered male and female ratios at birth are much higher
(C) cancer among children, and altered birth ratios of males and females occur much more frequently
(D) altered birth ratios of males and females, and children's cancer are much higher
(E) altered male and female ratios at birth, and cancer among children occur much more

The best way I found to solve this question is that there is a comparison between mining and non-mining communities.
So for comparison, there must be some comparison word such as more, less, smaller, etc
Now if you go through options ....You will find "more" for comparison in option C and E.
Option C seems more appropriate.
Hope this helps :)
User avatar
chrtpmdr
User avatar
Current Student
Joined: 24 Jul 2019
Last visit: 05 Oct 2022
Posts: 203
Own Kudos:
Given Kudos: 161
GMAT 1: 730 Q46 V45
GPA: 3.9
GMAT 1: 730 Q46 V45
Posts: 203
Kudos: 470
Kudos
Add Kudos
Bookmarks
Bookmark this Post
daagh

Sir, would you consider it redundant to say "much more frequently"?
I know it is a GMAC question, but as the meaning issue was very hard to resolve I ditched C) because I thought this showed clear redundance issues.
User avatar
daagh
User avatar
Major Poster
Joined: 19 Feb 2007
Last visit: 16 Oct 2020
Posts: 5,264
Own Kudos:
42,346
 [5]
Given Kudos: 422
Status: enjoying
Location: India
WE:Education (Education)
Expert
Expert reply
Posts: 5,264
Kudos: 42,346
 [5]
3
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
I wouldn't think so. 'Much' is an intensifier and 'more' is a comparator.The use of much is to say that the frequencies are happening in shorter intervals, whereas 'more' simply may mean that the total number is more than in one place than in the the other areas.
User avatar
aniket16c
User avatar
Current Student
Joined: 20 Oct 2018
Last visit: 05 Feb 2024
Posts: 180
Own Kudos:
153
 [1]
Given Kudos: 57
Location: India
GMAT 1: 690 Q49 V34
GMAT 2: 740 Q50 V40
GPA: 4
GMAT 2: 740 Q50 V40
Posts: 180
Kudos: 153
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Statisticians studying the health effect of uranium mining on Navajo communities have found other besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
- Children do not possess/own cancer - incorrect
- Use of "are" - correct
- Wrong

(B) cancer among children, and altered male and female ratios at birth are much higher
- "altered male and female ratios at birth" seems to suggest that a baby is x% female and y% male
- Wrong

(C) cancer among children, and altered birth ratios of males and females occur much more frequently
- Correct reference of cancer and birth rations
- Correct

(D) altered birth ratios of males and females, and children's cancer are much higher
- Children's cancer - wrong
- incorrect

(E) altered male and female ratios at birth, and cancer among children occur much more
- ratios at birth - wrong
- incorrect
avatar
debulwark
Joined: 27 Dec 2017
Last visit: 27 Jul 2021
Posts: 2
Own Kudos:
Given Kudos: 1
Posts: 2
Kudos: 2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
If the answers is c..then it means..altered birth ratios of male and female occur..how can a ratio occur..its not a phenomenon..cancer can occur,child defects can occur..but ratios..it doeant make sense to me..what u guys think?

Posted from my mobile device
User avatar
LIBERTYRodP
Joined: 30 Jan 2019
Last visit: 01 Apr 2024
Posts: 127
Own Kudos:
74
 [4]
Given Kudos: 14
Expert
Expert reply
Posts: 127
Kudos: 74
 [4]
2
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
Subject - Verb Agreement

In Summary

(A) children's cancer, and altered birth ratios of males and females are much higher ----- "are much higher" as a verb does not logically agree with the first two elements of the list: DEFECTS and CANCER. Additionally, "children's cancer" is wrong as the CANCER does not BELONG to the children.
(B) cancer among children, and altered male and female ratios at birth are much higher ----- "are much higher" as a verb does not logically agree with the first two elements of the list: DEFECTS and CANCER.
(C) cancer among children, and altered birth ratios of males and females occur much more frequently ---- CORRECT
(D) altered birth ratios of males and females, and children's cancer are much higher ----- "are much higher" as a verb does not logically agree with the elements of the list: DEFECTS and CANCER.
(E) altered male and female ratios at birth, and cancer among children occur much more ---- Wrong meaning. "ratios at birth" is wrong, since we are trying to say "birth ratios"
User avatar
ExpertsGlobal5
User avatar
Experts' Global Representative
Joined: 10 Jul 2017
Last visit: 12 Jul 2025
Posts: 5,143
Own Kudos:
4,729
 [9]
Given Kudos: 38
Location: India
GMAT Date: 11-01-2019
Expert
Expert reply
Posts: 5,143
Kudos: 4,729
 [9]
1
Kudos
Add Kudos
8
Bookmarks
Bookmark this Post
Dear Friends,

Here is a detailed explanation to this question-

Bunuel
Statisticians studying the health effect of uranium mining on Navajo communities have found other besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
(B) cancer among children, and altered male and female ratios at birth are much higher
(C) cancer among children, and altered birth ratios of males and females occur much more frequently
(D) altered birth ratios of males and females, and children's cancer are much higher
(E) altered male and female ratios at birth, and cancer among children occur much more

Choice A: Option A uses the phrase "children's cancer", which is quite awkward as it implies a type of cancer exclusive to children. Moreover, this answer choice utilizes the word "higher" to refer to an uncountable noun, "rates". Thus, Option A is incorrect.

Choice B: Option B commits the same error with regards to the word "higher", seen in Option A. Thus, Option B is incorrect.

Choice C: Option C is quite concise and uses the proper term "more" to denote the level of occurrences. Thus, Option C is correct.

Choice D: Option D displays the same errors that Option A does. Thus, Option D is incorrect.

Choice E: Option E also utilizes the awkward and inaccurate phrase "children's cancer". Thus, Option E is incorrect.

Hence, C is the best answer choice.

To understand the concept of “Collective, Countable, and Uncountable Nouns on GMAT”, you may want to watch the following video (~2 minutes):



All the best!
Experts' Global Team
avatar
Debo1988
Joined: 06 Oct 2019
Last visit: 28 May 2022
Posts: 43
Own Kudos:
Given Kudos: 71
Location: India
GMAT 1: 740 Q50 V41
Kudos
Add Kudos
Bookmarks
Bookmark this Post
GMATNinja

I'm keen to see your analysis of this question.
Thanks in advance!
User avatar
CrackverbalGMAT
User avatar
Major Poster
Joined: 03 Oct 2013
Last visit: 12 July 2025
Posts: 4,847
Own Kudos:
8,631
 [3]
Given Kudos: 225
Affiliations: CrackVerbal
Location: India
Expert
Expert reply
Posts: 4,847
Kudos: 8,631
 [3]
2
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
When you see the phrase ‘children’s cancer’ you should get the sense that all is not right here.

Quickly scan the options to see the alternatives that are provided.

‘cancer among children’ seems clear and elegant.

In Options A and B, you also notice that ‘higher’ is the wrong choice of word here.

Eliminate Options A and B.

Let’s move on to Options D and E.

Option D has ‘higher’ alongside ‘ratios’ – Eliminate.

Option E has ‘at birth’ which alters the meaning. Eliminate.

Option C is the best choice.

Hope this helps!
User avatar
dvnielng
Joined: 15 Jul 2019
Last visit: 15 Apr 2024
Posts: 36
Own Kudos:
Given Kudos: 305
Location: United Kingdom
GMAT 1: 730 Q49 V40
Products:
GMAT 1: 730 Q49 V40
Posts: 36
Kudos: 17
Kudos
Add Kudos
Bookmarks
Bookmark this Post
gmatt1476
Bunuel
Statisticians studying the health effect of uranium mining on Navajo communities have found other besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
(B) cancer among children, and altered male and female ratios at birth are much higher
(C) cancer among children, and altered birth ratios of males and females occur much more frequently
(D) altered birth ratios of males and females, and children's cancer are much higher
(E) altered male and female ratios at birth, and cancer among children occur much more


SC98561.01

Official Explanation

Diction; Logical predication

Statisticians have been studying the frequencies of various health outcomes in uranium mining areas in Navajo communities. They have found that certain kinds of bad outcomes occur much more frequently in mining communities than in non-mining communities.

We need to pick the answer choice that best expresses this finding. The use of the predicate higher is appropriate when applied to rates of illness. However, it is not appropriate when applied to medical conditions (except as an informal shorthand), e.g., a claim that birth defects . . . are much higher. That is, it is unclear what a higher birth defect might specify.

The meaning of altered male and female ratios is unclear, as opposed to altered birth ratios of males and females.

A. In this choice, the statement altered birth ratios . . . are much higher is unclear.

B. In this choice, the statement altered . . . ratios at birth are much higher is unclear.

C. Correct. The idea of the sentence is expressed clearly and the phrase occur much more frequently clearly specifies altered birth ratios.

D. In this choice, it is unclear what is higher: it could be birth ratios of males and females, children's cancer, or both.

E. In this choice, the modifier at birth implies, nonsensically, that the ratios were altered at the time of birth. Furthermore, male and female ratios implies that the ratios themselves are of male or female gender.

The correct answer is C.

altered birth ratios … are much higher is unclear.
- is this because, its like saying 'much higher then what exactly?'
User avatar
Mo2men
Joined: 26 Mar 2013
Last visit: 09 May 2023
Posts: 2,443
Own Kudos:
Given Kudos: 641
Concentration: Operations, Strategy
Schools: Erasmus (II)
Products:
Schools: Erasmus (II)
Posts: 2,443
Kudos: 1,438
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Statisticians studying the health effects of uranium mining on Navajo communities have found others besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
(B) cancer among children, and altered male and female ratios at birth are much higher
(C) cancer among children, and altered birth ratios of males and females occur much more frequently
(D) altered birth ratios of males and females, and children's cancer are much higher
(E) altered male and female ratios at birth, and cancer among children occur much more


SC98561.01

Dear GMATGuruNY

Can you help please with the above question?

1- is the usage of ' much higher' idiomatic or should be only 'more higher' ?

2- Why usage of higher here is wrong? 'ratios' are numbers so I can use 'higher' here. Or should be 'greater'? Is not the same as this example: the price of Mercedes is higher the price of Toyota

Thanks in advance
User avatar
GMATGuruNY
Joined: 04 Aug 2010
Last visit: 08 Jul 2025
Posts: 1,345
Own Kudos:
3,661
 [7]
Given Kudos: 9
Schools:Dartmouth College
Expert
Expert reply
Posts: 1,345
Kudos: 3,661
 [7]
6
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
Mo2men
1- is the usage of ' much higher' idiomatic or should be only 'more higher' ?

much higher is correct.
more higher is redundant and thus is incorrect.
On its own, -ER implies MORE.

Quote:
2- Why usage of higher here is wrong?

Birth defects, children's cancer, and altered birth ratios are much higher in mining than in non-mining communities.
Here, the portion in blue serves as the subject for are.
Conveyed meaning:

Birth defects are higher in mining communities than birth defects are high in non-mining communities.
This meaning is nonsensical, since a DEFECT cannot be HIGH.

Cancer is higher in mining communities than cancer is high in non-mining communities.
This meaning is nonsensical, since CANCER cannot be HIGH.

Altered birth ratios are higher in mining communities than altered birth ratios are high in non-mining communities.
Implication:
Birth ratios are altered in BOTH types of communities.
The altered birth ratios in mining communities are HIGHER.

The statement in red seems unintended.
The following meaning seems more likely:
Altered birth ratios in non-mining communities are RARE.
Altered birth ratios in mining communities are FAR MORE COMMON.

This meaning is conveyed by the OA:
Altered birth ratios OCCUR MUCH MORE FREQUENTLY in mining than in non-mining communities.
Implied comparison:
Altered birth ratios occur much more frequently in mining communities than altered birth ratios occur in non-mining communities.
In other words:
Altered birth ratios in non-mining communities are RARE.
User avatar
ProfChaos
Joined: 11 Apr 2020
Last visit: 06 Dec 2020
Posts: 122
Own Kudos:
Given Kudos: 630
GMAT 1: 660 Q49 V31
GMAT 1: 660 Q49 V31
Posts: 122
Kudos: 314
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Statisticians studying the health effects of uranium mining on Navajo communities have found others besides miners and mill workers to be affected; birth defects, children's cancer, and altered birth ratios of males and females are much higher in mining than in non-mining communities.

(A) children's cancer, and altered birth ratios of males and females are much higher
(B) cancer among children, and altered male and female ratios at birth are much higher
(C) cancer among children, and altered birth ratios of males and females occur much more frequently
(D) altered birth ratios of males and females, and children's cancer are much higher
(E) altered male and female ratios at birth, and cancer among children occur much more


SC98561.01

I used PoE to solve this one
1. Children's cancer vs cancer among children - the former means a type of cancer which happens to children, latter conveys the correct meaning
Options A and D - ELIMINATED

2. altered birth ratios of males and females vs altered male and female ratios at birth
Former is correct because at the birth this ratio is altered?? means something very different from what author is trying to convey
Options B and D - ELIMINATED

Thus, Option C is the correct answer
avatar
buan15
Joined: 14 Jun 2016
Last visit: 06 Jan 2022
Posts: 111
Own Kudos:
Given Kudos: 54
Location: India
GMAT 1: 610 Q49 V24
GMAT 2: 690 Q49 V33
WE:Engineering (Manufacturing)
Products:
GMAT 2: 690 Q49 V33
Posts: 111
Kudos: 233
Kudos
Add Kudos
Bookmarks
Bookmark this Post
CrackVerbalGMAT
When you see the phrase ‘children’s cancer’ you should get the sense that all is not right here.

Quickly scan the options to see the alternatives that are provided.

‘cancer among children’ seems clear and elegant.

In Options A and B, you also notice that ‘higher’ is the wrong choice of word here.

Eliminate Options A and B.

Let’s move on to Options D and E.

Option D has ‘higher’ alongside ‘ratios’ – Eliminate.

Option E has ‘at birth’ which alters the meaning. Eliminate.

Option C is the best choice.

Hope this helps!

Why "HIGHER" is wrong in option B.
Kindly explain in details. Thanks!
 1   2   
Moderators:
GMAT Club Verbal Expert
7349 posts
GMAT Club Verbal Expert
235 posts