Last visit was: 13 Sep 2026, 05:42 It is currently 13 Sep 2026, 05:42
Home
Messages
Tests
Schools
Events
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
Back to Forum
Create Topic
555-605 (Medium)|   Geometry|      
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 13 Sep 2026
Posts: 113,481
Own Kudos:
840,994
 [1]
Given Kudos: 111,490
Products:
GMAT Club Tests
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 113,481
Kudos: 840,994
 [1]
If three times the circumference of circle P is double the circumferen 21 Jun 2022, 05:45
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

35% (medium)

Question Stats:

59% (01:23) correct 41% (01:22) wrong based on 27 sessions

History

Date
Time
Result
Not Attempted Yet
If three times the circumference of circle P is double the circumference of circle Q, then the diameter of circle Q is how many times the radius of circle P?

A. 6
B. 3
C. 1.5
D. 4/3
E. 2/3
ShowHide Answer
Official Answer
B
User avatar
ThatDudeKnows
User avatar
Joined: 11 May 2022
Last visit: 27 Jun 2024
Posts: 1,070
Own Kudos:
1,072
Given Kudos: 79
Expert
Expert reply
Posts: 1,070
Kudos: 1,072
If three times the circumference of circle P is double the circumferen 21 Jun 2022, 07:03
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
If three times the circumference of circle P is double the circumference of circle Q, then the diameter of circle Q is how many times the radius of circle P?

A. 6
B. 3
C. 1.5
D. 4/3
E. 2/3
Show more

Before we start solving, wouldn't it really suck to know how to get the right answer, do all the math,...and then click the wrong answer because you do diameter:diameter or radius:radius? As soon as I spot that there's a little trap at the end of the question, I flip my computer mouse over. That way, when I go to click an answer, I have a reminder to make sure I took care of the trap.

On to the solution. Let's just make up values that are easy to work with. Make circumference of P = 2pi and circumference of Q = 3pi. Diameter of P = 1 and diameter of Q = 1.5. Radius of P = 0.5.
Diameter Q : Radius P = 1.5:0.5 = 3

Answer choice B.
User avatar
Solenja
User avatar
Joined: 23 Sep 2021
Last visit: 07 Dec 2025
Posts: 116
Own Kudos:
69
Given Kudos: 257
GRE 1: Q163 V157
GRE 1: Q163 V157
Posts: 116
Kudos: 69
If three times the circumference of circle P is double the circumferen 21 Jun 2022, 19:09
Kudos
Add Kudos
Bookmarks
Bookmark this Post
ThatDudeKnows
Bunuel
If three times the circumference of circle P is double the circumference of circle Q, then the diameter of circle Q is how many times the radius of circle P?

A. 6
B. 3
C. 1.5
D. 4/3
E. 2/3

Before we start solving, wouldn't it really suck to know how to get the right answer, do all the math,...and then click the wrong answer because you do diameter:diameter or radius:radius? As soon as I spot that there's a little trap at the end of the question, I flip my computer mouse over. That way, when I go to click an answer, I have a reminder to make sure I took care of the trap.

On to the solution. Let's just make up values that are easy to work with. Make circumference of P = 2pi and circumference of Q = 3pi. Diameter of P = 1 and diameter of Q = 1.5. Radius of P = 0.5.
Diameter Q : Radius P = 1.5:0.5 = 3

Answer choice B.
Show more
Can i take larger numbers (say 2 and 8)
User avatar
ThatDudeKnows
User avatar
Joined: 11 May 2022
Last visit: 27 Jun 2024
Posts: 1,070
Own Kudos:
1,072
 [1]
Given Kudos: 79
Expert
Expert reply
Posts: 1,070
Kudos: 1,072
 [1]
If three times the circumference of circle P is double the circumferen 21 Jun 2022, 20:00
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Solenja
ThatDudeKnows
Bunuel
If three times the circumference of circle P is double the circumference of circle Q, then the diameter of circle Q is how many times the radius of circle P?

A. 6
B. 3
C. 1.5
D. 4/3
E. 2/3

Before we start solving, wouldn't it really suck to know how to get the right answer, do all the math,...and then click the wrong answer because you do diameter:diameter or radius:radius? As soon as I spot that there's a little trap at the end of the question, I flip my computer mouse over. That way, when I go to click an answer, I have a reminder to make sure I took care of the trap.

On to the solution. Let's just make up values that are easy to work with. Make circumference of P = 2pi and circumference of Q = 3pi. Diameter of P = 1 and diameter of Q = 1.5. Radius of P = 0.5.
Diameter Q : Radius P = 1.5:0.5 = 3

Answer choice B.
Can i take larger numbers (say 2 and 8)
Show more

You can use whatever numbers you'd like...IF they meet the criteria stated in the question! In this case, we need numbers that make it true that "three times the circumference of circle P is double the circumference of circle Q." Would 2 and 8 meet that criteria?
User avatar
MBAHOUSE
User avatar
MBA House Admissions Consultant
Joined: 26 May 2022
Last visit: 23 Apr 2024
Posts: 336
Own Kudos:
104
 [1]
Expert
Expert reply
Posts: 336
Kudos: 104
 [1]
If three times the circumference of circle P is double the circumferen 21 Jun 2022, 20:13
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I did many steps to explain in detail for you, but of course you don’t need to do all these steps during the test, specially in a relatively simple question like that.
Let’s work.
Attachments

532B03EA-C418-4587-8091-7089F12D58B1.jpeg
532B03EA-C418-4587-8091-7089F12D58B1.jpeg [ 272.33 KiB | Viewed 993 times ]

Moderator:
Bunuel
Math Expert
113481 posts