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

It is currently 11 Dec 2018, 17:12

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.

M07-10

  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: 51100
M07-10  [#permalink]

Show Tags

New post 15 Sep 2014, 23:34
3
16
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

65% (01:25) correct 35% (02:13) wrong based on 157 sessions

HideShow timer Statistics

A welder received an order to make a 1 million liter cube-shaped tank. If he has only 4x2 meter sheets of metal that can be cut, how many metal sheets will be required for this order? (1 cubic meter = 1,000 liters)

A. 92
B. 90
C. 82
D. 78
E. 75

_________________

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 Sep 2009
Posts: 51100
Re M07-10  [#permalink]

Show Tags

New post 15 Sep 2014, 23:34
3
5
Official Solution:

A welder received an order to make a 1 million liter cube-shaped tank. If he has only 4x2 meter sheets of metal that can be cut, how many metal sheets will be required for this order? (1 cubic meter = 1,000 liters)

A. 92
B. 90
C. 82
D. 78
E. 75


1 million liter cube-shaped tank \(= \frac{1,000,000}{1,000} = 1,000\) cubic meter tank, which means that we have the cube-shaped tank with a side of \(10m\) (\(10^3=1,000\)).

Surface area of this tank would be \(6 \text{ (number of faces of a cube)} * 10^2 \text{ (area of each face)} = 600\) \(m^2\).

Number of \(4*2=8\) \(m^2\) sheets needed is \(\frac{600}{8}=75\).


Answer: E
_________________

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
Joined: 19 Sep 2014
Posts: 6
M07-10  [#permalink]

Show Tags

New post 21 Sep 2015, 10:30
1
Why does the tank need a cover? This confused me while answering the question. It would be good to make it clear that the tank needs a cover. For a cube-shaped tank that needs to contain 1 million liter only 62.5 sheets are necessary: we need 1 bottom and 4 sides with a required total of 500 square meter. 500/8=62.5. Edit: That would be 63 sheets
Intern
Intern
avatar
Joined: 22 Dec 2014
Posts: 1
Concentration: Finance, Economics
Schools: CBS '18
WE: Engineering (Consulting)
Re: M07-10  [#permalink]

Show Tags

New post 21 Dec 2015, 06:53
Since 63 is not an option there, you must consider tanks with covers.
Verbal Forum Moderator
avatar
Joined: 15 Apr 2013
Posts: 184
Location: India
Concentration: General Management, Marketing
GMAT Date: 11-23-2015
GPA: 3.6
WE: Science (Other)
GMAT ToolKit User Premium Member Reviews Badge
Re: M07-10  [#permalink]

Show Tags

New post 26 Dec 2015, 22:03
Hello,

Well the explanation is clear and concise.

I attempted the question with a 3D structure in mind.

Firstly we have a side of cube: 10 m

Secondly now how you could arrange 4 X 2 sheets in a 10 m side.

Interestingly if you draw the sheets in 10 X 10 side, you would only be able to put 12 such sheets in it with area of 2 X 2 remaining (I would try to draw it some other time): 12 X 6 = 72 sheets

Now as there are six sheets (in total) for the cube, so a total of 3 more sheets required to join adjacent sides.

This method took a little bit time to apply.

Thx
Intern
Intern
avatar
Joined: 23 Feb 2015
Posts: 2
Re: M07-10  [#permalink]

Show Tags

New post 16 Mar 2016, 14:29
Hi Bunuel,

the sheets of metal shouldn't be in m^2? instead of meter, or the word "sheet" should already refer to a surface.

thanks
M
Manager
Manager
avatar
Joined: 19 Jan 2016
Posts: 72
Location: India
Concentration: Strategy
Premium Member
Re: M07-10  [#permalink]

Show Tags

New post 24 Apr 2016, 02:14
Skytail wrote:
Why does the tank need a cover? This confused me while answering the question. It would be good to make it clear that the tank needs a cover. For a cube-shaped tank that needs to contain 1 million liter only 62.5 sheets are necessary: we need 1 bottom and 4 sides with a required total of 500 square meter. 500/8=62.5. Edit: That would be 63 sheets


Can someone explain this concept?
Intern
Intern
avatar
Joined: 25 Jun 2013
Posts: 10
Re: M07-10  [#permalink]

Show Tags

New post 23 Jun 2016, 16:11
why do you divide 1,000,000 / 1000 to get the 1000 cubic meter tank? isn't 1,000,000 already the volume of the tank?

I got the answer 7500 because I didn't divide the 1000 at the beginning.
Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 7099
Re: M07-10  [#permalink]

Show Tags

New post 23 Jun 2016, 19:37
1
glochou wrote:
why do you divide 1,000,000 / 1000 to get the 1000 cubic meter tank? isn't 1,000,000 already the volume of the tank?

I got the answer 7500 because I didn't divide the 1000 at the beginning.


Hi,

the VOLUME of liquid inside is in LITER, but we cannot have the volume of TANK also in same units..
so we require to change liters to cubic meter..


and it is given in the Q that 1 cubic meter = 1000 liters........ so 75000 liters = 75 cubic meter
_________________

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

Intern
Intern
avatar
Joined: 22 Dec 2015
Posts: 5
Premium Member
Re: M07-10  [#permalink]

Show Tags

New post 19 Aug 2016, 09:29
Is there a typo in the question? Because if not, then wouldn't we also be able to use 90 sheets of metal (60 in 4x2, and 30 in 2x2, with 15 sheets of metal per side 4x2x10 and 2x2x5) ?
Senior Manager
Senior Manager
User avatar
Joined: 31 Mar 2016
Posts: 385
Location: India
Concentration: Operations, Finance
GMAT 1: 670 Q48 V34
GPA: 3.8
WE: Operations (Commercial Banking)
GMAT ToolKit User Premium Member
Re M07-10  [#permalink]

Show Tags

New post 20 Aug 2016, 03:46
I think this is a high-quality question and I agree with explanation.
Manager
Manager
avatar
Joined: 03 Dec 2013
Posts: 70
Location: United States (HI)
GMAT 1: 660 Q49 V30
GPA: 3.56
Re M07-10  [#permalink]

Show Tags

New post 22 Aug 2016, 10:17
I think this is a high-quality question and I agree with explanation.
Intern
Intern
avatar
B
Joined: 19 Nov 2012
Posts: 29
CAT Tests
Re: M07-10  [#permalink]

Show Tags

New post 07 Feb 2018, 01:27
Thanks chetan2u!
Intern
Intern
avatar
B
Joined: 03 Sep 2017
Posts: 15
Location: Brazil
GMAT 1: 730 Q49 V41
Reviews Badge
Re: M07-10  [#permalink]

Show Tags

New post 03 Mar 2018, 14:44
atturhari wrote:
Skytail wrote:
Why does the tank need a cover? This confused me while answering the question. It would be good to make it clear that the tank needs a cover. For a cube-shaped tank that needs to contain 1 million liter only 62.5 sheets are necessary: we need 1 bottom and 4 sides with a required total of 500 square meter. 500/8=62.5. Edit: That would be 63 sheets


Can someone explain this concept?


I also did not understand.
Why do we need to consider it with the cover?
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 51100
Re: M07-10  [#permalink]

Show Tags

New post 04 Mar 2018, 05:43
vitorcbarbieri wrote:
atturhari wrote:
Skytail wrote:
Why does the tank need a cover? This confused me while answering the question. It would be good to make it clear that the tank needs a cover. For a cube-shaped tank that needs to contain 1 million liter only 62.5 sheets are necessary: we need 1 bottom and 4 sides with a required total of 500 square meter. 500/8=62.5. Edit: That would be 63 sheets


Can someone explain this concept?


I also did not understand.
Why do we need to consider it with the cover?


Please check here: https://gmatclub.com/forum/a-welder-rec ... 26154.html

Hope it helps.
_________________

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
Joined: 14 Nov 2018
Posts: 1
CAT Tests
Re M07-10  [#permalink]

Show Tags

New post 23 Nov 2018, 17:24
I think this is a poor-quality question and I agree with explanation. There are a lot of information not included in this question. For example, do we need to ensure that the 4x2 sheets will fit on one face of the tank or are they allowed to bend around the corners? also, is one layer of sheet metal acceptable? Or will we need to do an inside and outside layer? There won't be a door to this tank or any kind of opening, such as in the top of the tank?
GMAT Club Bot
Re M07-10 &nbs [#permalink] 23 Nov 2018, 17:24
Display posts from previous: Sort by

M07-10

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

Moderators: chetan2u, Bunuel



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®.