GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 05 Apr 2020, 18:57

### 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

# At an international conference, “Red” world countries and “Blue” world

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 62498
At an international conference, “Red” world countries and “Blue” world  [#permalink]

### Show Tags

11 Feb 2020, 03:05
00:00

Difficulty:

15% (low)

Question Stats:

89% (01:48) correct 11% (02:29) wrong based on 57 sessions

### HideShow timer Statistics

At an international conference, “Red” world countries and “Blue” world countries are the only participants. The ratio of “Red” world participants to “Blue” world participants is 5:4. If one-third of “Red” world participants are left-handed and two-thirds of “Blue” world participants are left-handed, then what is the fraction of the participants who are left-handed?

(A) 13/36
(B) 13/27
(C) 14/27
(D) 23/36
(E) 23/37

_________________
GMAT Club Legend
Joined: 18 Aug 2017
Posts: 6018
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: At an international conference, “Red” world countries and “Blue” world  [#permalink]

### Show Tags

11 Feb 2020, 05:08
let total = 27
so Red = 5/9 * 27 ; 15
and Blue = 4/9 * 27; 12
Red LH = 15 *1/3 ; 5 and RH ; 10
Blue LH = 2/3 *12 ; 8 and Rh ; 4
total LH of participants ; 13/27
IMO B

Bunuel wrote:
At an international conference, “Red” world countries and “Blue” world countries are the only participants. The ratio of “Red” world participants to “Blue” world participants is 5:4. If one-third of “Red” world participants are left-handed and two-thirds of “Blue” world participants are left-handed, then what is the fraction of the participants who are left-handed?

(A) 13/36
(B) 13/27
(C) 14/27
(D) 23/36
(E) 23/37
Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 9960
Location: United States (CA)
Re: At an international conference, “Red” world countries and “Blue” world  [#permalink]

### Show Tags

17 Feb 2020, 03:29
Bunuel wrote:
At an international conference, “Red” world countries and “Blue” world countries are the only participants. The ratio of “Red” world participants to “Blue” world participants is 5:4. If one-third of “Red” world participants are left-handed and two-thirds of “Blue” world participants are left-handed, then what is the fraction of the participants who are left-handed?

(A) 13/36
(B) 13/27
(C) 14/27
(D) 23/36
(E) 23/37

If there are 27 total participants, then the number of “Red” world participants is 15, and the number of “Blue” world participants is 12.

Thus, 1/3 x 15 = 5 “Red” world participants are left-handed and 2/3 x 12 = 8 “Blue” world participants are left-handed.

So, (5 + 8)/27 = 13/27 of the participants are left-handed.

_________________

# Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
197 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: At an international conference, “Red” world countries and “Blue” world   [#permalink] 17 Feb 2020, 03:29
Display posts from previous: Sort by