Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
17 Nov 2007, 15:46
Kudos
Bookmarks
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
100% (00:55) correct
0%
(00:00)
wrong
based on 2
sessions
History
Date
Time
Result
Not Attempted Yet
Here it is!
Official Answer in Bold!
If anyone can explain step by step it would be much appreciated!
~ Ev
The volume of a sphere with radius r is (4/3)Pir^3 and the surface area is 4Pi(r^3) If a spherical balloon has a volume of 972Pi cubic centimeters, what is the surface area of the balloon in square centimeters?
(A) 324
(B) 729
(C) 243Pi
(D) 324Pi
(E) 729Pi
Official Answer in Bold!
If anyone can explain step by step it would be much appreciated!
~ Ev
The volume of a sphere with radius r is (4/3)Pir^3 and the surface area is 4Pi(r^3) If a spherical balloon has a volume of 972Pi cubic centimeters, what is the surface area of the balloon in square centimeters?
(A) 324
(B) 729
(C) 243Pi
(D) 324Pi
(E) 729Pi
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
17 Nov 2007, 16:22
Kudos
Bookmarks
V=4pi/3 * r^3
S=4Pi * r^2
1. V=4pi/3 * r^3 => r=(3/4pi * V)^1/3
2. S=4pi*(3/4pi * V)^2/3 => ~ 12 * (3/(4*3) * 1000*3)^2/3
~ 12 * (0,75 * 1000)^2/3
~ 12 * 0,9 * 10^2
~ 1000
~ 300 pi
but too many evaluations...
S=4Pi * r^2
1. V=4pi/3 * r^3 => r=(3/4pi * V)^1/3
2. S=4pi*(3/4pi * V)^2/3 => ~ 12 * (3/(4*3) * 1000*3)^2/3
~ 12 * (0,75 * 1000)^2/3
~ 12 * 0,9 * 10^2
~ 1000
~ 300 pi
but too many evaluations...
18 Nov 2007, 06:32
Kudos
Bookmarks
V = 4 x Pi x 1/3 x r^3
S = 4 x Pi x r^2
Appearantly, S = 3V/r
All we need is an approximate value of the redius of the sphere.
if V = 972 pi .. then 972 = 4/3 r^3 --> r^3 = 729
now we should be able to detect that 729 is 9 cubed
r = 9
S = 3V/9 = V/3 = 324 Pi
S = 4 x Pi x r^2
Appearantly, S = 3V/r
All we need is an approximate value of the redius of the sphere.
if V = 972 pi .. then 972 = 4/3 r^3 --> r^3 = 729
now we should be able to detect that 729 is 9 cubed
r = 9
S = 3V/9 = V/3 = 324 Pi
