NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 01:53 It is currently 25 Apr 2024, 01:53
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

The only contents in a container are green disks, blue disks

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
sanjoo
Senior Manager
Senior Manager
Joined: 06 Aug 2011
Posts: 269
Own Kudos [?]: 596 [17]
Given Kudos: 82
Send PM
The only contents in a container are green disks, blue disks [#permalink] New post   07 Jan 2014, 04:08
5
Kudos
12
Bookmarks
00:00
A
B
C
D
E

Difficulty:

15% (low)

Question Stats:

78% (01:12) correct 22% (01:32) wrong based on 374 sessions
Hide Show timer Statistics
The only contents in a container are green disks, blue disks, and orange disks. If one disk is selected at random from the container, what is the probability that the disk is orange?

(1) The ratio of the number of orange disks to the number of disks that are not orange is 7 to 36.

(2) The ratio of the number of green disks to the number of blue disks is 7 to 3, and the ratio of the number of green disks to the number of orange disks is 18 to 5.
ShowHide Answer
Official Answer
D
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92912
Own Kudos [?]: 618879 [3]
Given Kudos: 81595
Send PM
CAT Tests Forum Quiz Mode
The only contents in a container are green disks, blue disks [#permalink] New post   07 Jan 2014, 04:37
1
Kudos
2
Bookmarks
Expert Reply
The only contents in a container are green disks, blue disks, and orange disks. If one disk is selected at random from the container, what is the probability that the disk is orange?

(1) The ratio of the number of orange disks to the number of disks that are not orange is 7 to 36 --> (orange)/(not orange) = 7/36 --> (orange)/(orange + not orange) = (orange)/(total) = 7/(7 + 36) = 7/43. Sufficient.

(2) The ratio of the number of green disks to the number of blue disks is 7 to 3, and the ratio of the number of green disks to the number of orange disks is 18 to 5 --> (green)/(blue) = 7/3 = 126/54 and (green)/(orange) = 18/5 = 126/35 --> (orange)/(blue + green + orange) = 35/(54 + 126 + 35) = 7/43. Sufficient.

Answer: D.
avatar
ashutoshbarawkar
Intern
Intern
Joined: 26 Jun 2014
Posts: 4
Own Kudos [?]: 54 [0]
Given Kudos: 1
Send PM
Re: The only contents in a container are green disks, blue disks [#permalink] New post   01 Sep 2014, 20:42
Hi Bunel ... should'nt it be 126/126+35+54 ???? RATHER THAN 25/.....
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92912
Own Kudos [?]: 618879 [0]
Given Kudos: 81595
Send PM
CAT Tests Forum Quiz Mode
Re: The only contents in a container are green disks, blue disks [#permalink] New post   01 Sep 2014, 21:46
Expert Reply
ashutoshbarawkar wrote:
Hi Bunel ... should'nt it be 126/126+35+54 ???? RATHER THAN 25/.....


Should read: (orange)/(blue + green + orange) = 35/(54 + 126 + 35) = 7/43. Typo edited, Thank you.
User avatar
B
lor12345
Intern
Intern
Joined: 26 Sep 2017
Posts: 11
Own Kudos [?]: 4 [0]
Given Kudos: 16
Send PM
Re: The only contents in a container are green disks, blue disks [#permalink] New post   19 Oct 2017, 11:03
Bunuel wrote:
The only contents in a container are green disks, blue disks, and orange disks. If one disk is selected at random from the container, what is the probability that the disk is orange?

(1) The ratio of the number of orange disks to the number of disks that are not orange is 7 to 36 --> (orange)/(not orange) = 7/36 --> (orange)/(orange + not orange) = (orange)/(total) = 7/(7 + 36) = 7/43. Sufficient.

(2) The ratio of the number of green disks to the number of blue disks is 7 to 3, and the ratio of the number of green disks to the number of orange disks is 18 to 5 --> (green)/(blue) = 7/3 = 126/54 and (green)/(orange) = 18/5 = 126/35 --> (orange)/(blue + green + orange) = 35/(54 + 126 + 35) = 7/43. Sufficient.

Answer: D.


Hi Bunuel,
Can you please explain how did we get 126/54 and 126/35?
(green)/(blue) = 7/3 = 126/54 and (green)/(orange) = 18/5 = 126/35
Thanks
User avatar
B
vaibhavanant
Intern
Intern
Joined: 05 Oct 2017
Posts: 12
Own Kudos [?]: 1 [0]
Given Kudos: 2
Send PM
GMAT ToolKit User
Re: The only contents in a container are green disks, blue disks [#permalink] New post   19 Oct 2017, 11:13
lor12345 wrote:
Bunuel wrote:
The only contents in a container are green disks, blue disks, and orange disks. If one disk is selected at random from the container, what is the probability that the disk is orange?

(1) The ratio of the number of orange disks to the number of disks that are not orange is 7 to 36 --> (orange)/(not orange) = 7/36 --> (orange)/(orange + not orange) = (orange)/(total) = 7/(7 + 36) = 7/43. Sufficient.

(2) The ratio of the number of green disks to the number of blue disks is 7 to 3, and the ratio of the number of green disks to the number of orange disks is 18 to 5 --> (green)/(blue) = 7/3 = 126/54 and (green)/(orange) = 18/5 = 126/35 --> (orange)/(blue + green + orange) = 35/(54 + 126 + 35) = 7/43. Sufficient.

Answer: D.


Hi Bunuel,
Can you please explain how did we get 126/54 and 126/35?
(green)/(blue) = 7/3 = 126/54 and (green)/(orange) = 18/5 = 126/35
Thanks

In order to make ratios comparable we multiply by the common multiple of bot the ratios...so 7x18= 126
And 7x5= 35

Sent from my SM-G610F using GMAT Club Forum mobile app
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32663
Own Kudos [?]: 821 [0]
Given Kudos: 0
Send PM
Re: The only contents in a container are green disks, blue disks [#permalink] New post   22 Nov 2023, 03:49
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: The only contents in a container are green disks, blue disks [#permalink]
22 Nov 2023, 03:49
Moderator:
Bunuel
Math Expert
92904 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