NEW HERE? LEARN MORE
closeclose
It is currently 18 Apr 2024, 06:02
Register
GMAT Focus Tests
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

A metallic cubical box was hammered and moulded into a rectangular box

10 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Question banks

Question Banks

Downloads
My Bookmarks
Reviews
User avatar
L
pushpitkc
Senior PS Moderator
Joined: 26 Feb 2016
Posts: 2873
Location: India
GPA: 3.12
A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  14 Apr 2019, 02:47
1
Kudos
1
Bookmarks
00:00
A
B
C
D
E

Difficulty:

65% (hard)

Question Stats:

58% (02:18) correct 42% (01:55) wrong based on 81 sessions
Hide Show timer Statistics
A metallic cubical box was hammered and moulded into a rectangular box such that the only change was that the breadth got tripled. What was the percentage change in total surface area?

A. 33.33%
B. 66.67%
C. 100%
D. 133.33%
E. 200%

Source: Experts Global

Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.
User avatar
D
saukrit
Senior Manager
Senior Manager
Joined: 05 Jul 2018
Status:Current student at IIMB
Affiliations: IIM Bangalore
Posts: 384
Location: India
Concentration: General Management, Technology
Schools: IIMB EPGP'22 (A)
GMAT 1: 600 Q47 V26
GRE 1: Q162 V149
GPA: 3.6
WE:Information Technology (Consulting)
Reviews Badge
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  Updated on: 16 Apr 2019, 01:36
2
Kudos
Although the scenario is too hypothetical to think of, wherein just one side of the new cuboid has tripled after hammering and everything else remains unchanged, yet considering the hypothesis to be real the answer goes as below.

Tripling one side of the cuboid the surface area becomes 14x of the original surface area 6x.

Percent Change in Volume=\(\frac{8x}{6x}*100\) = 133.33%

Hence, the answer is D

Originally posted by saukrit on 14 Apr 2019, 03:06.
Last edited by saukrit on 16 Apr 2019, 01:36, edited 1 time in total.
User avatar
S
Sanjeetgujrall
Manager
Manager
Joined: 04 Sep 2016
Posts: 50
Location: Germany
GPA: 3
CAT Tests
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  15 Apr 2019, 02:10
2
Kudos
themindful wrote:
Although the scenario is too hypothetical to think of, wherein just one side of the new cuboid has tripled after hammering and everything else remains unchanged, yet considering the hypothesis to be real the answer goes as below.

Tripling one side of the cuboid the volume become 3x of the original volume x.

Change in Volume=\(\frac{(3x-x)}{x}*100\) = 200%

Hence, the answer is E


I think the answer is D. They have asked change in surface area and not volume

Posted from my mobile device
avatar
B
SantoshSukumaran
Intern
Intern
Joined: 13 Jul 2018
Posts: 22
Location: India
Schools: EDHEC
GPA: 2.49
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  15 Apr 2019, 12:28
Hi the question stem asks % change in surface area.

Posted from my mobile device
avatar
B
SantoshSukumaran
Intern
Intern
Joined: 13 Jul 2018
Posts: 22
Location: India
Schools: EDHEC
GPA: 2.49
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  15 Apr 2019, 12:30
Will the answer be option D

Posted from my mobile device
User avatar
D
saukrit
Senior Manager
Senior Manager
Joined: 05 Jul 2018
Status:Current student at IIMB
Affiliations: IIM Bangalore
Posts: 384
Location: India
Concentration: General Management, Technology
Schools: IIMB EPGP'22 (A)
GMAT 1: 600 Q47 V26
GRE 1: Q162 V149
GPA: 3.6
WE:Information Technology (Consulting)
Reviews Badge
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  16 Apr 2019, 01:39
Sanjeetgujrall wrote:
themindful wrote:
Although the scenario is too hypothetical to think of, wherein just one side of the new cuboid has tripled after hammering and everything else remains unchanged, yet considering the hypothesis to be real the answer goes as below.

Tripling one side of the cuboid the volume become 3x of the original volume x.

Change in Volume=\(\frac{(3x-x)}{x}*100\) = 200%

Hence, the answer is E


I think the answer is D. They have asked change in surface area and not volume

Posted from my mobile device

Thanks for highlighting. Updated my response. My bad :)
User avatar
G
Maxximus
Experts' Global Representative
Joined: 19 Feb 2010
Posts: 261
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  19 Jul 2019, 04:18
Expert Reply
Interestingly, some students wrote to us saying that if the width is changed, the volume also changed and that is not possible by hammering (as volume of the solid must remain constant). The mistake in that approach is that one is confusing volume of the "box" (not a solid, as such) with the volume of the "metal" (or solid). Imagine, the box is empty inside and practically, the volume of the box is the volume of the empty space and not the volume of the metal enclosing the empty space :-)
_________________
The world's most complete GMAT online prep course | Start your free trial
Get the world's most powerful GMAT mobile app free- Includes 200+ GMAT videos, 12 SC books, and more...
The world's most exhaustive GMAT test-series- 15 full length tests with video explanations and rigorous analytics | Get the first test free!
Signature Read More
User avatar
B
Salman_Iqbal_Bappy
Intern
Intern
Joined: 24 Aug 2017
Posts: 7
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  21 Jul 2019, 09:41
Tripling one side of the cuboid the surface area becomes 14x of the original surface area 6x.
How??? Can you explain???

Posted from my mobile device
avatar
S
Saurabhminocha
Intern
Intern
Joined: 24 Oct 2017
Posts: 36
Location: India
Schools: Owen '22 (A$) Kelley '22 (A$) Kenan-Flagler '22 (WA) Georgia Tech '22 (II)
GMAT 1: 710 Q48 V39
GPA: 3.39
GMAT ToolKit User
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  21 Jul 2019, 22:44
surface area = 2(Lw+wh+Lh)
original S.A. = 6a^2
new = 2(a*3a + 3a*a + a*a) = 14a^2

%change = (14a^2 - 6a^2)/ 6a^2 *100% = (8/6)*100 = 133.33% (D)
User avatar
B
Salman_Iqbal_Bappy
Intern
Intern
Joined: 24 Aug 2017
Posts: 7
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink] New post  21 Jul 2019, 22:48
Saurabhminocha wrote:
surface area = 2(Lw+wh+Lh)
original S.A. = 6a^2
new = 2(a*3a + 3a*a + a*a) = 14a^2

%change = (14a^2 - 6a^2)/ 6a^2 *100% = (8/6)*100 = 133.33% (D)

thanks a lot...I get it now.

Posted from my mobile device

Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: A metallic cubical box was hammered and moulded into a rectangular box [#permalink]
21 Jul 2019, 22:48
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderators:
Bunuel
Math Expert
92747 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions