A circular rim 28 inches in diameter rotates the same number : GMAT Problem Solving (PS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 25 Feb 2017, 01:57

### 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

# A circular rim 28 inches in diameter rotates the same number

Author Message
TAGS:

### Hide Tags

Manager
Joined: 07 Dec 2010
Posts: 116
Concentration: Marketing, General Management
Followers: 0

Kudos [?]: 31 [0], given: 12

A circular rim 28 inches in diameter rotates the same number [#permalink]

### Show Tags

04 Oct 2011, 19:36
2
This post was
BOOKMARKED
00:00

Difficulty:

55% (hard)

Question Stats:

73% (03:14) correct 27% (03:35) wrong based on 26 sessions

### HideShow timer Statistics

A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the later rim make in terms of x?

A) $$\frac{48P}{x}$$
B) 75x
C) 48x
D) 24x
E) $$\frac{x}{75}$$

[Reveal] Spoiler:
Attachment:

Rimrotation.jpeg [ 87.55 KiB | Viewed 1667 times ]
[Reveal] Spoiler: OA
Intern
Joined: 01 Mar 2006
Posts: 23
Followers: 0

Kudos [?]: 11 [0], given: 1

### Show Tags

04 Oct 2011, 20:19
Is it only me that I am not able to see the attachment ? Am i missing some privilege?
Manager
Joined: 07 Dec 2010
Posts: 116
Concentration: Marketing, General Management
Followers: 0

Kudos [?]: 31 [0], given: 12

### Show Tags

04 Oct 2011, 21:33
kulki wrote:
Is it only me that I am not able to see the attachment ? Am i missing some privilege?

Please click on the attachment .it will be visible
Intern
Joined: 17 Dec 2010
Posts: 13
Schools: ISB
Followers: 0

Kudos [?]: 4 [0], given: 2

### Show Tags

04 Oct 2011, 23:02
[(Rev/sec) x circumference] of 28 inches rim = [(Rev/sec) x circumference] of 35 inches rim
$$x$$ x 28$$Pi$$ = $$y$$ x 35$$Pi$$
$$y$$ = $$\frac{4}{5}x$$

But this is rev/sec. Converting to minutes we get
$$y$$ = $$\frac{4}{5}x$$ x 60
$$y$$ = 48$$x$$
Intern
Joined: 26 May 2011
Posts: 19
Location: United States
Followers: 0

Kudos [?]: 57 [2] , given: 0

### Show Tags

05 Oct 2011, 08:15
2
KUDOS
braxus wrote:
[(Rev/sec) x circumference] of 28 inches rim = [(Rev/sec) x circumference] of 35 inches rim
$$x$$ x 28$$Pi$$ = $$y$$ x 35$$Pi$$
$$y$$ = $$\frac{4}{5}x$$

But this is rev/sec. Converting to minutes we get
$$y$$ = $$\frac{4}{5}x$$ x 60
$$y$$ = 48$$x$$

Missed the per minute thing....
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 13959
Followers: 591

Kudos [?]: 167 [0], given: 0

Re: A circular rim 28 inches in diameter rotates the same number [#permalink]

### Show Tags

06 May 2016, 04:16
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.
_________________
Re: A circular rim 28 inches in diameter rotates the same number   [#permalink] 06 May 2016, 04:16
Similar topics Replies Last post
Similar
Topics:
A circular rim 28 inches in diameter rotates the same number of inches 1 12 Oct 2014, 21:31
A circular rim A having a diameter of 28 inches is rotating 3 16 Aug 2013, 08:50
4 A circular rim 28 inches in diameter rotates the same number of inches 4 30 Sep 2010, 19:38
76 A circular rim 28 inches in diameter rotates the same number 23 08 Jun 2008, 11:01
9 A circular mat with diameter 20 inches is placed on a square 5 19 Nov 2007, 18:03
Display posts from previous: Sort by