GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 11 Dec 2018, 01:10

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
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • Free GMAT Prep Hour

     December 11, 2018

     December 11, 2018

     09:00 PM EST

     10:00 PM EST

    Strategies and techniques for approaching featured GMAT topics. December 11 at 9 PM EST.
  • The winning strategy for 700+ on the GMAT

     December 13, 2018

     December 13, 2018

     08:00 AM PST

     09:00 AM PST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

Oil executive: While it is true that the number of reported oil spills

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 51096
Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 25 Jun 2018, 21:18
1
6
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

58% (01:24) correct 43% (01:44) wrong based on 280 sessions

HideShow timer Statistics

Oil executive: While it is true that the number of reported oil spills per year has increased steadily over the last three decades, this is much more a function of how easy it is to detect small oil spills than of an increase in frequency of oil spills overall. In the past the only spills reported were those large enough to be detected by environmentalists and journalists. Nowadays analytics will report to the authorities even the smallest fissures in pipelines and tankers.

Which of the following, if true, best supports the executive’s argument?


A. The size of the average oil spill has decreased over the last three decades.

B. The number of large and medium oil spills has remained roughly constant over the last three decades.

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 7100
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 25 Jun 2018, 22:08
Oil executive: While it is true that the number of reported oil spills per year has increased steadily over the last three decades, this is much more a function of how easy it is to detect small oil spills than of an increase in frequency of oil spills overall. In the past the only spills reported were those large enough to be detected by environmentalists and journalists. Nowadays analytics will report to the authorities even the smallest fissures in pipelines and tankers.

Which of the following, if true, best supports the executive’s argument?


A. The size of the average oil spill has decreased over the last three decades.
Tempting but not correct....
it does not give a relation between the actual numbers. SAY earlier there were 10 reported per year and their average size was 10 sq miles but now there are 50 of size of 10 sq miles and another 100 of size of 1 sq miles, so here average miles is 4 sq miles( 50*10+100*1)/150


B. The number of large and medium oil spills has remained roughly constant over the last three decades.
This clearly tells us that the increase has been only in reporting of small oil spills.. CORRECT

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.
Does not effect the main point

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.
the argument is about the size and number and NOT the cost .. reduction could be b ecause of improved technology

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.
again out of context... the volume of oil could have increased more than 3 folds or remained the same

B
_________________

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


GMAT online Tutor

Manager
Manager
avatar
B
Joined: 08 Oct 2015
Posts: 241
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 25 Jun 2018, 22:40
chetan2u wrote:
Oil executive: While it is true that the number of reported oil spills per year has increased steadily over the last three decades, this is much more a function of how easy it is to detect small oil spills than of an increase in frequency of oil spills overall. In the past the only spills reported were those large enough to be detected by environmentalists and journalists. Nowadays analytics will report to the authorities even the smallest fissures in pipelines and tankers.

Which of the following, if true, best supports the executive’s argument?


A. The size of the average oil spill has decreased over the last three decades.
Tempting but not correct....
it does not give a relation between the actual numbers. SAY earlier there were 10 reported per year and their average size was 10 sq miles but now there are 50 of size of 10 sq miles and another 100 of size of 1 sq miles, so here average miles is 4 sq miles( 50*10+100*1)/150


B. The number of large and medium oil spills has remained roughly constant over the last three decades.
This clearly tells us that the increase has been only in reporting of small oil spills.. CORRECT

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.
Does not effect the main point

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.
the argument is about the size and number and NOT the cost .. reduction could be b ecause of improved technology

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.
again out of context... the volume of oil could have increased more than 3 folds or remained the same

B


can you please elaborate more on A?
IMO, A is actually weakening the statement.
The exec says that the total number of spills (reported and non reported) has not increased and has thus remained the same. If this is the case, then the average of the 2 time periods which more or less be the same, as nothing has changed. But what A says is that, the average size ( of all existing spills and NOT ONLY REPORTED) has infact decreased over time. This sort of weakens it.

chetan2u
Director
Director
User avatar
P
Joined: 14 Dec 2017
Posts: 519
Location: India
Premium Member
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 25 Jun 2018, 23:12
Bunuel wrote:
Oil executive: While it is true that the number of reported oil spills per year has increased steadily over the last three decades, this is much more a function of how easy it is to detect small oil spills than of an increase in frequency of oil spills overall. In the past the only spills reported were those large enough to be detected by environmentalists and journalists. Nowadays analytics will report to the authorities even the smallest fissures in pipelines and tankers.

Which of the following, if true, best supports the executive’s argument?


A. The size of the average oil spill has decreased over the last three decades.

B. The number of large and medium oil spills has remained roughly constant over the last three decades.

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.



Question Type: Strengthen

Premise: The # of oil spills reported has increased over the past three decades. In the past the only oil spills detected & reported were ones which were large. Nowadays every small oil spill can be detected & reported.

Conclusion: It is easier now then 3 decades ago to detect small oil spills hence the the # of oils spill reported is higher.

Analysis: The oil executive has stated a fact that even the smallest of the oil spills can be detected now & that # of oil spills has increased. However the total quantity of oil spilled is not discussed, hence if we know the change in total quantity of oil spilled, we can deduce the contribution of small oil spills. Either way it has to be a flaw in observation of the trend in oil spills, so as to strengthen the conclusion


A. The size of the average oil spill has decreased over the last three decades. - This can be due to increase in both Total quantity of oil spilled & the # of oil spills or just an increase in # of oil spills. For e.g. consider three decades ago 10,000 barrels of total oil spilled & reported was 10 spills, hence average is 100 barrel per spill & now 100,000 barrels is spilled & reported # of spills is 100,000, hence average is 1 barrel per spill or now # of spills is 2000, hence average is 50 barrel per spill. Hence the low average could be because small or large oil spills. Incorrect

B. The number of large and medium oil spills has remained roughly constant over the last three decades. - Clear winner, as only small oil spills contribute to the increase in # of oil spills. Correct

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades. - Out of scope - Incorrect.

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades. - This can seem like that it is saying that the # of small oil spills has increased, as there is less oil to clean & hence cost has reduced. However the cost could also come down due to improvement in technology or cheap labour. Incorrect

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago. - This in a way weakens the argument. Incorrect.


Answer B.


Thanks,
GyM
_________________

New to GMAT Club - https://gmatclub.com/forum/new-to-gmat-club-need-help-271131.html#p2098335

BSchool Forum Moderator
avatar
P
Joined: 05 Jul 2017
Posts: 490
Location: India
GMAT 1: 700 Q49 V36
GPA: 4
CAT Tests
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 25 Jun 2018, 23:17
A good GMAT like question considering there is word play in the question

the oil expert essentially says that the # of oil spills has not increased. The oil expert is reporting more numbers because of the ability to determine the undetected oil spills(small oil spills) that happened all this years.

If this is the case, then the large oil spill has to remain constant for the argument to hold true or else we have more # of spills.

Only option B does that. I think all other options are irrelevant
_________________

My journey From 410 to 700 :-)
Here's my experience when I faced a glitch in my GMAT Exam
Don't do this mistake when you give your GMATPrep Mock!
NEW GMATPrep software analysis by Bunuel

Manager
Manager
avatar
B
Joined: 27 Jul 2016
Posts: 74
GMAT 1: 730 Q49 V40
WE: Consulting (Consulting)
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 25 Jun 2018, 23:27
I think its' B because if the number of medium and large size did not change, then author can claim that it is because of the precision of the device.
SC Moderator
User avatar
V
Joined: 23 Sep 2015
Posts: 1549
GMAT ToolKit User Premium Member Reviews Badge CAT Tests
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 26 Jun 2018, 15:59
Only B talks about the number of oil spills as does the argument. rest all choices are use less.

B should be the answer.
_________________

Thanks!
Do give some kudos.

Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

Want to improve your Score:
GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 51096
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 29 Jun 2018, 03:12
Bunuel wrote:
Oil executive: While it is true that the number of reported oil spills per year has increased steadily over the last three decades, this is much more a function of how easy it is to detect small oil spills than of an increase in frequency of oil spills overall. In the past the only spills reported were those large enough to be detected by environmentalists and journalists. Nowadays analytics will report to the authorities even the smallest fissures in pipelines and tankers.

Which of the following, if true, best supports the executive’s argument?


A. The size of the average oil spill has decreased over the last three decades.

B. The number of large and medium oil spills has remained roughly constant over the last three decades.

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.



VERITAS PREP OFFICIAL SOLUTION:



In this strengthen question, take careful note of the oil executive's conclusion, which is that the increase in reported oil spills (he concedes this is a fact) has occurred because it is easier to detect small oil spills, not because there are more oil spills. In other words, the total number of oil spills is the same, and the increased number of reports of them is due to the more-frequent reporting of small spills.

Note how correct answer (B) directly strengthens that: if you know (from the argument) that there are more reported spills overall, and you know (from choice B) that the number of large and medium spills is unchanged, then the increase has to have come from the reporting of those small spills. (B) limits the increase to the smaller spills, and therefore furthers the executive's argument.

Note that with choice (A), the conclusion isn't that there are more small oil spills total but that there have been more reported. So the fact that the average spill is smaller doesn't directly relate to the executive's argument. Furthermore, even if the average reported spill were smaller, that doesn't necessarily mean that there are more small spills being reported - it could just be that each of the larger and medium spills reported have been smaller (maybe they were better-controlled than in the past, for example).

Choice (C) might seem to suggest a reason that there are fewer spills (there is less time/space that each barrel spends in transit) but this misses the general purpose of the argument, which relates to the detection of small spills. The argument isn't that there are fewer transportation-related spills, but that the increase in reported skills comes primarily from the detection of smaller spills.

Choices (D) and (E) each attempt to use cost as proxy for safety - (D) wants you to think that because the cost of cleanup is down, the spills must be less frequent or smaller, but that's not necessarily the reason. Perhaps cleanup technology has just gotten less expensive. Similarly (E) wants you to think that because companies are spending more to prevent spills, spills have decreased or stayed the same. But that's not necessarily the case: what if inflation is higher and the companies are spending less in "real" terms and more nominally because of the currency, for example?

Only choice (B), which is correct, directly relates to the detection of small spills.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Intern
Intern
avatar
B
Joined: 29 Jun 2018
Posts: 3
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 13 Nov 2018, 06:38
Conclusion: The increase in smaller oil spills being reported have caused the increase in "reported" oil spills over the past three decades.

A. The size of the average oil spill has decreased over the last three decades.
- If the average oil spill has decreased which MAY mean that smaller oil spills have increased to cause the average to drop, but we do not know for sure.

B. The number of large and medium oil spills has remained roughly constant over the last three decades.
- If the large and medium oil spill have remained constant then the ONLY way total oil spills could increase is if small spills increased. This looks promising.

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.
- Just because barrel of oil travels a shorter distance doesn't mean that causes spills. Irrelevant.

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.
- We don't care about increases or decreases in cost - Out of scope.

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.
- Again, spending money on equipment is not relevant to the conclusion.

Answer: B
Intern
Intern
avatar
B
Joined: 29 Jun 2018
Posts: 3
Re: Oil executive: While it is true that the number of reported oil spills  [#permalink]

Show Tags

New post 13 Nov 2018, 06:40
Conclusion: The increase in smaller oil spills being reported have caused the increase in "reported" oil spills over the past three decades.

A. The size of the average oil spill has decreased over the last three decades.
- If the average oil spill has decreased which MAY mean that smaller oil spills have increased to cause the average to drop, but we do not know for sure.

B. The number of large and medium oil spills has remained roughly constant over the last three decades.
- If the large and medium oil spill have remained constant then the ONLY way total oil spills could increase is if small spills increased. This looks promising.

C. Because of improved logistics, the average distance a barrel of oil travels to its destination has decreased by 40% over the last three decades.
- Just because barrel of oil travels a shorter distance doesn't mean that causes spills. Irrelevant.

D. The cost required to clean up the average oil spill has decreased by over 20% over the last three decades.
- We don't care about increases or decreases in cost - Out of scope.

E. The average oil company spends nearly twice as much today on anti-spill equipment as it spent three decades ago.
- Again, spending money on equipment is not relevant to the conclusion.

Answer: B
GMAT Club Bot
Re: Oil executive: While it is true that the number of reported oil spills &nbs [#permalink] 13 Nov 2018, 06:40
Display posts from previous: Sort by

Oil executive: While it is true that the number of reported oil spills

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.