BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Cost of painting

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 304
Joined: Wed Jan 27, 2010 8:35 amFollowed by: 3 members
Location: International Space Station
Thanked: 11 times
by Aman verma » Wed Oct 05, 2011 8:43 am
Q: An open box is made of wood 2cm thick. It's internal length is 86 cm , breadth 46 cm and height is 38 cm. The cost of painting the outer surface of the box at $ 10 per square meter is:

a) $ 8.65

b) $ 10.00

c) $ 11.65

d) $ 17.50

e) $ 18.50

[spoiler][/spoiler]OA[spoiler]c) $ 11.65[/spoiler]
800. Arjun's-Bird-Eye
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 496
Joined: Tue Jun 07, 2011 5:34 amFollowed by: 1 member
Thanked: 38 times

by sl750 » Wed Oct 05, 2011 9:19 am
External length = 90 cm
External breadth = 50 cm
External height = 38 cm

The rectangular box has 6 sides. One side is open

2 sides will have area 2*(50*38) = 3800 cm^2
2 sides will have area 2*(90*38) = 6840 cm^2
1 side will have area 90*50 = 4500 cm^2

In square meters it is 1.5140
Cost of painting the box is $10/square meter. Total cost = $15.14

I don't seem to be getting the desired answer
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 158
Joined: Sat Sep 03, 2011 10:31 amFollowed by: 2 members
Thanked: 29 times

by gmatclubmember » Wed Oct 05, 2011 9:22 am
sl750 wrote:External length = 90 cm
External breadth = 50 cm
External height = 38 cm

The rectangular box has 6 sides. One side is open

2 sides will have area 2*(50*38) = 3800 cm^2
2 sides will have area 2*(90*38) = 6840 cm^2
1 side will have area 90*50 = 4500 cm^2

In square meters it is 1.5140
Cost of painting the box is $10/square meter. Total cost = $15.14

I don't seem to be getting the desired answer
The area to be painted would be 2*h(l+b) = 2*38(90+50)
and this will give the answer as 11.64 which is C.
a lil' Thank note goes a long way :)!!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 496
Joined: Tue Jun 07, 2011 5:34 amFollowed by: 1 member
Thanked: 38 times

by sl750 » Wed Oct 05, 2011 9:41 am
gmatclubmember wrote:
sl750 wrote:External length = 90 cm
External breadth = 50 cm
External height = 38 cm

The rectangular box has 6 sides. One side is open

2 sides will have area 2*(50*38) = 3800 cm^2
2 sides will have area 2*(90*38) = 6840 cm^2
1 side will have area 90*50 = 4500 cm^2

In square meters it is 1.5140
Cost of painting the box is $10/square meter. Total cost = $15.14

I don't seem to be getting the desired answer
The area to be painted would be 2*h(l+b) = 2*38(90+50)
and this will give the answer as 11.64 which is C.
Well, I did consider the possibility that the problem might be ignoring the base as well, nevertheless, the cost comes to $10.64
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 304
Joined: Wed Jan 27, 2010 8:35 amFollowed by: 3 members
Location: International Space Station
Thanked: 11 times

by Aman verma » Thu Oct 06, 2011 8:02 am
Thanks guys for answering and raising doubt, even as per my calculation the answer comes to be $ 15.70 . But I think the answer provided by Gmatclubmeber has some merit. Normally nobody paints the bottom of a box and I am still not clear about the outer surface mentioned in the question. I have consulted with the source but they are pretty insistent about the answer to be c)11.65. Though, I am still in doubt. I thought the height to be 40. I would like to have other's suggestion on this.
800. Arjun's-Bird-Eye
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 496
Joined: Tue Jun 07, 2011 5:34 amFollowed by: 1 member
Thanked: 38 times

by sl750 » Thu Oct 06, 2011 8:17 am
As I mentioned in my earlier post, even if you exclude the base, the cost equals $10.64 and not $11.64.
The height won't change.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 304
Joined: Wed Jan 27, 2010 8:35 amFollowed by: 3 members
Location: International Space Station
Thanked: 11 times

by Aman verma » Thu Oct 06, 2011 9:08 am
sl750 wrote:As I mentioned in my earlier post, even if you exclude the base, the cost equals $10.64 and not $11.64.
The height won't change.
But please explain why the height won't change. Shouldn't the wood of the base extend 2 cm beneath the sides
800. Arjun's-Bird-Eye
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 496
Joined: Tue Jun 07, 2011 5:34 amFollowed by: 1 member
Thanked: 38 times

by sl750 » Thu Oct 06, 2011 9:30 am
The extension is only along the x and y axes, not the z axes. The only way to see this is if you can draw a box or visualize it
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 91
Joined: Fri Jan 17, 2014 7:34 am
Thanked: 7 times

by parveen110 » Sun Mar 09, 2014 5:26 am
I tried visualising. But I still don't understand why height won't change?? If internal height is 38cm then the external height would include the height of the base i.e. 2 cm more.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 91
Joined: Fri Jan 17, 2014 7:34 am
Thanked: 7 times

by parveen110 » Sun Mar 09, 2014 5:27 am
I tried visualising. But I still don't understand why height won't change. If internal height is 38cm then the external height would include the height of the base i.e. 2 cm more.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
Elite Legendary Member
Posts: 10392
Joined: Sun Jun 23, 2013 6:38 pmFollowed by: 511 members
Location: Palo Alto, CA
Thanked: 2867 times
GMAT Score:800

by [email protected] » Sun Mar 09, 2014 8:38 pm
Hi parveen110,

Don't worry about this question. It's written in something of an ambiguous fashion. Since the prompt refers to the cost of painting the "outer surface", it stands to reason that the "bottom" of the box should also be painted (but apparently the solution doesn't include it). The question also states that the box is made of wood that is 2cm thick; the proper visualization would be to add 2cm to each of the dimensions TWICE (but the solution doesn't do that either; it assumes that the "outside height" and the "inside height" of the box are the same).

GMAT writers create (and vet) questions to a significant degree; the test would not include an active question (that counted) that was written in this fashion. It is possible that this might, in some rare set of circumstances, show up as an experimental question, but I'll bet that you'll never see anything written in this odd style on your GMAT. You'll be tested on the basic geometry formulas behind this question though.

GMAT assassins aren't born, they're made,
Rich
Contact Rich at [email protected]
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1