What is the volume of a certain rectangular solid? (1) Two : DS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 20 Jan 2017, 05:35

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the volume of a certain rectangular solid? (1) Two

Author Message
VP
Joined: 18 Nov 2004
Posts: 1440
Followers: 2

Kudos [?]: 37 [0], given: 0

What is the volume of a certain rectangular solid? (1) Two [#permalink]

### Show Tags

09 May 2005, 18:03
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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.

What am I missing here ?
VP
Joined: 18 Nov 2004
Posts: 1440
Followers: 2

Kudos [?]: 37 [0], given: 0

### Show Tags

09 May 2005, 18:58
It is but isn't "B" suff.....we know areas of all the faces and can calculate the volume. Wording of B seems to be lil off. What u make out of "B" ?
VP
Joined: 25 Nov 2004
Posts: 1493
Followers: 7

Kudos [?]: 98 [0], given: 0

### Show Tags

09 May 2005, 19:46
banerjeea_98 wrote:
It is but isn't "B" suff.....we know areas of all the faces and can calculate the volume. Wording of B seems to be lil off. What u make out of "B" ?

from B, how do you know the area of all the faces? you might be confused with "Each of two opposite faces of the solid has area 40". i do not think that it means all opposite faces. suppose we have the following faces:
front=a
back=b
right = c
left=d
up=e
down/bottom=f

i think "Each of two opposite faces of the solid has area 40" = either a and b or c and d or e and f have the same area.
hope helps.
Senior Manager
Joined: 15 Mar 2005
Posts: 419
Location: Phoenix
Followers: 2

Kudos [?]: 26 [0], given: 0

### Show Tags

10 May 2005, 00:41
banerjeea_98 wrote:
It is but isn't "B" suff.....we know areas of all the faces and can calculate the volume. Wording of B seems to be lil off. What u make out of "B" ?

I think MA is right Baner.

Guess you're thinking that "all" the surfaces ("each" opposite pair of surfaces) have an area 40 - which makes the rectangular solid collapse to a cuboid.

I just tried solving the prob:
if length = l, breadth = b and height = h,

(A) lxb = 15, lxh= 24.
Two equations, three variables. Unsolvable.

(B) Two opposite surfaces have area 40 each.
Thus, either, lxb = 40, or hxb = 40 or lxh = 40.
One equation, three variables. Unsolvable.

Combining A and B,
Therefore, 3 equations, three variables. Solvable.
_________________

Who says elephants can't dance?

VP
Joined: 13 Jun 2004
Posts: 1118
Location: London, UK
Schools: Tuck'08
Followers: 7

Kudos [?]: 45 [0], given: 0

### Show Tags

10 May 2005, 01:51
At the begining I wanted to say A

We know that the two adjacent faces of the solid have areas 15 and 24, respectively. The faces are ajacent which means that they have a side in common, the best way is to find thefactors of both areas :
15 = 3*5 and 24=3*8 so logically one side is 3, another is 5 and the last one is 8.

However I realized later that I didn't take into account the possibility to get some decimal numbers....
VP
Joined: 18 Nov 2004
Posts: 1440
Followers: 2

Kudos [?]: 37 [0], given: 0

### Show Tags

10 May 2005, 05:43
yeah...OA is "C"....state 2 threw me off. I still think "B" is poorly worded.
10 May 2005, 05:43
Display posts from previous: Sort by