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

 It is currently 15 Oct 2019, 03:06

### 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

# Marty has a right circular cylindrical pool of diameter 12 feet and hi

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 58327
Marty has a right circular cylindrical pool of diameter 12 feet and hi  [#permalink]

### Show Tags

30 Oct 2018, 03:21
00:00

Difficulty:

(N/A)

Question Stats:

82% (01:32) correct 18% (01:35) wrong based on 39 sessions

### HideShow timer Statistics

Marty has a right circular cylindrical pool of diameter 12 feet and his neighbor, Rusty, has a right circular cylindrical pool of diameter 18 feet. If the depths of the pools are equal, then the volume of water in Rusty's pool is how many times that in Marty's pool?

A. 1.5
B. 2.25
C. 2.5
D. 4
E. 4.25

_________________
Manager
Joined: 09 Jun 2018
Posts: 188
Location: United States
GPA: 3.95
WE: Manufacturing and Production (Energy and Utilities)
Re: Marty has a right circular cylindrical pool of diameter 12 feet and hi  [#permalink]

### Show Tags

Updated on: 31 Oct 2018, 19:19
1
Volume of cylinder = pi*$$d^2$$*h/4

So ratio of volumes when height is same, is the ratio of the diameters.

Ratio = $$18^2$$/$$12^2$$ = $$(3/2)^2$$ = 9/4 = 2.25

Option B
_________________
If you found this relevant and useful, please Smash that Kudos button!

Originally posted by nkin on 30 Oct 2018, 12:30.
Last edited by nkin on 31 Oct 2018, 19:19, edited 1 time in total.
Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8043
Location: United States (CA)
Re: Marty has a right circular cylindrical pool of diameter 12 feet and hi  [#permalink]

### Show Tags

31 Oct 2018, 18:25
Bunuel wrote:
Marty has a right circular cylindrical pool of diameter 12 feet and his neighbor, Rusty, has a right circular cylindrical pool of diameter 18 feet. If the depths of the pools are equal, then the volume of water in Rustys pool is how many times that in Martys pool?

A. 1.5
B. 2.25
C. 2.5
D. 4
E. 4.25

If we assume that the height of both pools is h, then the volume of Marty’s pool is π * 6^2 * h = 36πh, and the volume of Rusty’s pool is π * 9^2 * h = 81πh. Therefore, the volume of Rusty’s pool is 81πh/36πh = 81/36 = 9/4 = 2.25 times that of Marty’s pool.

_________________

# Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Re: Marty has a right circular cylindrical pool of diameter 12 feet and hi   [#permalink] 31 Oct 2018, 18:25
Display posts from previous: Sort by

# Marty has a right circular cylindrical pool of diameter 12 feet and hi

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

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne