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

It is currently 16 Nov 2018, 05:58

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 November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     November 17, 2018

     November 17, 2018

     07:00 AM PST

     09:00 AM PST

    Nov. 17, 7 AM PST. Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • GMATbuster's Weekly GMAT Quant Quiz # 9

     November 17, 2018

     November 17, 2018

     09:00 AM PST

     11:00 AM PST

    Join the Quiz Saturday November 17th, 9 AM PST. The Quiz will last approximately 2 hours. Make sure you are on time or you will be at a disadvantage.

What is the surface area of a certain rectangle solid?

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

Hide Tags

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6517
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
What is the surface area of a certain rectangle solid?  [#permalink]

Show Tags

New post 06 Mar 2016, 02:59
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

59% (01:21) correct 41% (01:09) wrong based on 128 sessions

HideShow timer Statistics

What is the surface area of a certain rectangle solid?

1) The volume of the solid is 96
2) The one face’s area of the solid is 12


* A solution will be posted in two days.

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Intern
Intern
User avatar
B
Joined: 18 Jul 2015
Posts: 18
GMAT 1: 530 Q43 V20
WE: Analyst (Consumer Products)
GMAT ToolKit User CAT Tests
Re: What is the surface area of a certain rectangle solid?  [#permalink]

Show Tags

New post 06 Mar 2016, 16:35
Hello Math Revolution,

Below is my reasoning. Please review the same, and tell me if I have made a mistake.

Surface area of a rectangular solid = 2 LW + 2 WH + 2 HL

1. Insufficient: Does not provide information on the length, width and height
Volume = L x W x H
96 = L x W x H

2. Insufficient: Does not provide information on the other two faces by itself.
Suppose, 12 = L x W

Combining Both;
96 = 12 x H => H = 8; Insufficient: Cannot deduce the L and W

Answer: E
CEO
CEO
User avatar
P
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2700
Location: India
GMAT: INSIGHT
WE: Education (Education)
Reviews Badge
Re: What is the surface area of a certain rectangle solid?  [#permalink]

Show Tags

New post 07 Mar 2016, 04:28
MathRevolution wrote:
What is the surface area of a certain rectangle solid?

1) The volume of the solid is 96
2) The one face’s area of the solid is 12


* A solution will be posted in two days.


To know the Surface Area of rectangular solid we need the dimensions of the solid

Question : Surface Area of Solid = ?

Statement 1: The volume of the solid is 96
i.e. L*B*H = 96
we nee to calculate 2(LB+BH+LH) but the individual products of two sides at a time are missing hence
NOT SUFFICIENT

Statement 2: The one face’s area of the solid is 12
Other sides are missing hence
NOT SUFFICIENT

Combining the two statements
L*B*H = 96 and AREA of one face = 12
let BH= 12
i.e. L = 96/12 = 8
but BH = 12 may give us either B=2 H= 6 or B=3 H=4 giving us different values and hence different values of Area. Hence
NOT SUFFICIENT

Answer: Option E
_________________

Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6517
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re: What is the surface area of a certain rectangle solid?  [#permalink]

Show Tags

New post 07 Mar 2016, 15:40
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.

What is the surface area of a certain rectangle solid?

1) The volume of the solid is 96
2) The one face’s area of the solid is 12


There are 3 variables(length, width, height) for a rectangular solid, which should match with the number of equations. So you need 3 equations. For 1) 1 equation, for 2) 1 equation, which makes E the answer.
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Math Revolution GMAT Instructor
User avatar
V
Joined: 16 Aug 2015
Posts: 6517
GMAT 1: 760 Q51 V42
GPA: 3.82
Premium Member
Re: What is the surface area of a certain rectangle solid?  [#permalink]

Show Tags

New post 08 Mar 2016, 04:29
Pritishd wrote:
Hello Math Revolution,

Below is my reasoning. Please review the same, and tell me if I have made a mistake.

Surface area of a rectangular solid = 2 LW + 2 WH + 2 HL

1. Insufficient: Does not provide information on the length, width and height
Volume = L x W x H
96 = L x W x H

2. Insufficient: Does not provide information on the other two faces by itself.
Suppose, 12 = L x W

Combining Both;
96 = 12 x H => H = 8; Insufficient: Cannot deduce the L and W

Answer: E



You are also right. It is simper and better to solve this way: for a rectangular, there are 3 variables(width, length, height). In order to match with the number of equations. So you need 3 equation, which makes E the answer.
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 8784
Premium Member
Re: What is the surface area of a certain rectangle solid?  [#permalink]

Show Tags

New post 10 Oct 2017, 02:37
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Bot
Re: What is the surface area of a certain rectangle solid? &nbs [#permalink] 10 Oct 2017, 02:37
Display posts from previous: Sort by

What is the surface area of a certain rectangle solid?

  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®.