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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

What is the volume of a certain rectangular solid? (1) Two [#permalink]
24 Aug 2008, 16:29

1

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

71% (01:53) correct
29% (02:04) wrong based on 65 sessions

What is the volume of a certain rectangular solid? (1) Two adjacent faces of the solid have areas 15 and 24, respectively. (2) Each of two opposite faces of the solid has area 40.

Please provide your answer explanations. Lets also take it a step further. If you say it can be solved, could you please show how would you solve it. I know you dont need to solve DS questions but this would be a great question for PS as well.

Re: DS rectangular solid [#permalink]
24 Aug 2008, 17:19

this is one where you have to draw a diagram. It uses mostly math intuition instead of formulas and such. draw a rectangular solid in 3-D and write in the areas 15, 24, and 40 on the three faces. after staring for a few seconds, you can see that the only sides that make sense are 3,5, and 8. bc 3x5=15 8x3=24 and 5x8=40. and these can be set up to be adjacent as they are in the stimulus. so the answer is 3x5x8=120

PS Answer: 120

However, since 15 and 24 have two common factors, 3 and 1, just saying that they are adjacent does not do the trick (whereas two prime numbers would, like 7 and 5) so you cant predict the common side of the faces with just (1), so the third area must be known, where (2) gives you this information. And also these are the only sides that can be used to create the three areas in this manner. Therefore, DS Answer: C

Re: DS rectangular solid [#permalink]
24 Aug 2008, 18:34

1

This post received KUDOS

1

This post was BOOKMARKED

elmagnifico wrote:

What is the volume of a certain rectangular solid? (1) Two adjacent faces of the solid have areas 15 and 24, respectively. (2) Each of two opposite faces of the solid has area 40.

Please provide your answer explanations. Lets also take it a step further. If you say it can be solved, could you please show how would you solve it. I know you dont need to solve DS questions but this would be a great question for PS as well.

Re: DS rectangular solid [#permalink]
24 Aug 2008, 23:23

1

This post was BOOKMARKED

elmagnifico wrote:

What is the volume of a certain rectangular solid? (1) Two adjacent faces of the solid have areas 15 and 24, respectively. (2) Each of two opposite faces of the solid has area 40.

A.

1) two adjecent faces should have one side common.

15 = 5 * 3 24 = 3 * 8

3 is the side that is common, remaining sides are 5, 8

Re: DS rectangular solid [#permalink]
26 Aug 2008, 15:52

yeah you have to know all the area of all three faces or you cannot answer the question because the shared side could be any number that is a factor of the area of both sides. e.g. 1,3, or as x2 pointed out, any real number less than 15.

MBA Acceptance Rate by Country Most top American business schools brag about how internationally diverse they are. Although American business schools try to make sure they have students from...

McCombs Acceptance Rate Analysis McCombs School of Business is a top MBA program and part of University of Texas Austin. The full-time program is small; the class of 2017...

My swiss visa stamping is done and my passport was couriered through Blue dart. It took 5 days to get my passport stamped and couriered to my address. In...