NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 02:41 It is currently 25 Apr 2024, 02:41
Decision Tracker
My Rewards
New posts
New comers' posts

Close
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
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

A gas pipe has an outside diameter of 24 inches. The steel wall of the

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92912
Own Kudos [?]: 618888 [5]
Given Kudos: 81595
Send PM
CAT Tests Forum Quiz Mode
A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink] New post   14 Jun 2019, 00:45
5
Bookmarks
Expert Reply
00:00
A
B
C
D
E

Difficulty:

35% (medium)

Question Stats:

71% (01:45) correct 29% (01:42) wrong based on 139 sessions
Hide Show timer Statistics
A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

A. 23π

B. 47π

C. 147π

D. 529π

E. 575π
ShowHide Answer
Official Answer
A
User avatar
L
CareerGeek
VP
VP
Joined: 20 Jul 2017
Posts: 1300
Own Kudos [?]: 3450 [1]
Given Kudos: 162
Location: India
Concentration: Entrepreneurship, Marketing
GMAT 1: 690 Q51 V30
WE:Education (Education)
Send PM
A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink] New post   Updated on: 14 Jun 2019, 02:09
1
Kudos
Bunuel wrote:
A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

A. 23π

B. 47π

C. 147π

D. 529π

E. 575π


**Edited

Area of cross-section of the steel wall of the pipe = π*(12)^2 - π*(11)^2
= π(12 + 11)(12 - 11)
= 23π

IMO Option A

Pls Hit Kudos if you like the solution

Originally posted by CareerGeek on 14 Jun 2019, 00:55.
Last edited by CareerGeek on 14 Jun 2019, 02:09, edited 2 times in total.
avatar
B
basabidas
Intern
Intern
Joined: 19 Mar 2018
Posts: 4
Own Kudos [?]: 2 [1]
Given Kudos: 21
Send PM
Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink] New post   14 Jun 2019, 02:04
1
Kudos
Dillesh4096 wrote:
Bunuel wrote:
A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

A. 23π

B. 47π

C. 147π

D. 529π

E. 575π


Area of cross-section of the steel wall of the pipe = π*(24)^2 - π*(23)^2
= π(24 - 23)(24 + 23)
= 47π

IMO Option B

Pls Hit Kudos if you like the solution


Hi,

In the question the diameter is given for the pipe, so won't the equation be π(12-11)(12+11)=23π?
User avatar
L
CareerGeek
VP
VP
Joined: 20 Jul 2017
Posts: 1300
Own Kudos [?]: 3450 [1]
Given Kudos: 162
Location: India
Concentration: Entrepreneurship, Marketing
GMAT 1: 690 Q51 V30
WE:Education (Education)
Send PM
Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink] New post   14 Jun 2019, 02:06
1
Kudos
basabidas wrote:
Dillesh4096 wrote:
Bunuel wrote:
A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

A. 23π

B. 47π

C. 147π

D. 529π

E. 575π


Area of cross-section of the steel wall of the pipe = π*(24)^2 - π*(23)^2
= π(24 - 23)(24 + 23)
= 47π

IMO Option B

Pls Hit Kudos if you like the solution


Hi,

In the question the diameter is given for the pipe, so won't the equation be π(12-11)(12+11)=23π?


Hey sry I got carried away with the posts.
You’re right
Kudos

Posted from my mobile device
User avatar
L
dcummins
VP
VP
Joined: 14 Feb 2017
Posts: 1115
Own Kudos [?]: 2163 [0]
Given Kudos: 368
Location: Australia
Concentration: Technology, Strategy
Schools: INSEAD Sept'21 Intake (WA$) Melbourne (A$) AGSM (A$) Kellogg '23 (WL) Said '22 (A$) CBS '23 (D) Booth '23 (D) Anderson '23 (WL) Cambridge '22 (WL) LBS '23 (D) Stern '24 (WA)
GMAT 1: 560 Q41 V26
GMAT 2: 550 Q43 V23
GMAT 3: 650 Q47 V33
GMAT 4: 650 Q44 V36
GMAT 5: 600 Q38 V35
GMAT 6: 710 Q47 V41
WE:Management Consulting (Consulting)
Send PM
Reviews Badge
Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink] New post   13 Sep 2019, 14:18
Diameter of the total pipe = 24
Deduct 2 inches (1 inch from top and bottom) from the diameter to get the diameter of the inner pipe = 22

Find the difference in the area between the two
12^2 pi - 11^2pi
=23pi
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32665
Own Kudos [?]: 821 [0]
Given Kudos: 0
Send PM
Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink] New post   17 May 2023, 04:38
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.
GMAT Club Bot
gmatclubot
Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink]
17 May 2023, 04:38
Moderators:
Bunuel
Math Expert
92912 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions