NEW HERE? LEARN MORE
closeclose
Last visit was: 26 Apr 2024, 17:17 It is currently 26 Apr 2024, 17:17
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

There are 35 students in a college lecture theater. What is the ratio

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
avatar
B
mbamuch
Intern
Intern
Joined: 28 May 2018
Posts: 12
Own Kudos [?]: 14 [3]
Given Kudos: 8
Location: United States (MI)
Schools: Yale '22 (WD) Ross '22 (WA$) Duke '22 (WD) Booth '22 (D) Kellogg '22 (A) CBS '22 (D) Sloan '22 (A)
GMAT 1: 730 Q49 V40
GRE 1: Q166 V164
GPA: 3.79
Send PM
There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   Updated on: 24 Jun 2018, 00:13
3
Bookmarks
00:00
A
B
C
D
E

Difficulty:

15% (low)

Question Stats:

81% (01:06) correct 19% (01:12) wrong based on 118 sessions
Hide Show timer Statistics
There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.


Show Spoiler
This might sound silly. Is it same to assume that GMAT only considers Male and Female genders?

For example, the DS question below

Is it safe to assume (1) is sufficient?
ShowHide Answer
Official Answer
D

Originally posted by mbamuch on 23 Jun 2018, 21:29.
Last edited by Bunuel on 24 Jun 2018, 00:13, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
User avatar
B
Antreev
Intern
Intern
Joined: 07 Jun 2018
Status:Student
Posts: 48
Own Kudos [?]: 35 [0]
Given Kudos: 15
Location: India
Concentration: Finance, Marketing
GPA: 4
Send PM
GMAT ToolKit User
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   23 Jun 2018, 22:49
omersanjay wrote:
This might sound silly. Is it same to assume that GMAT only considers Male and Female genders?

For example, the DS question below

"There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5."

Is it safe to assume (1) is sufficient?


Yes Gmat assumes only two genders.
Moreover I think the answer should be D as Even second statement is enough to find the ratio.

Posted from my mobile device
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92948
Own Kudos [?]: 619244 [0]
Given Kudos: 81609
Send PM
CAT Tests Forum Quiz Mode
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   24 Jun 2018, 00:18
Expert Reply
omersanjay wrote:
There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.


Show Spoiler
This might sound silly. Is it same to assume that GMAT only considers Male and Female genders?

For example, the DS question below

Is it safe to assume (1) is sufficient?


There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

This implies that there are 24 females, thus the ratio is 10/25. Sufficient.


(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.

The statement tells us that 2m/f = 4/5. Together with m + f = 35 we have two distinct linear equations, so we can solve for m and f and get the ratio. Sufficient.

Answer: D.

P.S. Yes, you can consider only two genders.
User avatar
B
Antreev
Intern
Intern
Joined: 07 Jun 2018
Status:Student
Posts: 48
Own Kudos [?]: 35 [0]
Given Kudos: 15
Location: India
Concentration: Finance, Marketing
GPA: 4
Send PM
GMAT ToolKit User
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   24 Jun 2018, 00:58
Bunuel wrote:
omersanjay wrote:
There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.


Show Spoiler
This might sound silly. Is it same to assume that GMAT only considers Male and Female genders?

For example, the DS question below

Is it safe to assume (1) is sufficient?


There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

This implies that there are 24 females, thus the ratio is 10/25. Sufficient.


(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.

The statement tells us that 2m/f = 4/5. Together with m + f = 35 we have two distinct linear equations, so we can solve for m and f and get the ratio. Sufficient.

Answer: D.

P.S. Yes, you can consider only two genders.



Bunuel
since we know 2m/f=4/5
can we just simplify this equation to find m/f? we can cut 4 by 2 and we get the answer. Can we do that?

Posted from my mobile device
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92948
Own Kudos [?]: 619244 [0]
Given Kudos: 81609
Send PM
CAT Tests Forum Quiz Mode
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   24 Jun 2018, 01:07
Expert Reply
Antreev wrote:
Bunuel wrote:
omersanjay wrote:
There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.


Show Spoiler
This might sound silly. Is it same to assume that GMAT only considers Male and Female genders?

For example, the DS question below

Is it safe to assume (1) is sufficient?


There are 35 students in a college lecture theater. What is the ratio of male students to female students in the lecture theater?

(1) There are 10 male students in the lecture theater.

This implies that there are 24 females, thus the ratio is 10/25. Sufficient.


(2) If the number of male students in the lecture theater was doubled, the ratio of male students to female students in the lecture theater would be 4 to 5.

The statement tells us that 2m/f = 4/5. Together with m + f = 35 we have two distinct linear equations, so we can solve for m and f and get the ratio. Sufficient.

Answer: D.

P.S. Yes, you can consider only two genders.



Bunuel
since we know 2m/f=4/5
can we just simplify this equation to find m/f? we can cut 4 by 2 and we get the answer. Can we do that?

Posted from my mobile device


Yes, sure. We don't need the values of am and f.
avatar
smilesingh
Intern
Intern
Joined: 25 Jul 2017
Posts: 2
Own Kudos [?]: 1 [0]
Given Kudos: 3
Send PM
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   24 Jun 2018, 06:23
Bunuel
I think we have to solve for m and f for option B. Because if the values of m and f comes out to be in fraction and not integer then the answer would be A and not D. Am in right?
User avatar
B
keykers1
Intern
Intern
Joined: 25 Jun 2022
Posts: 5
Own Kudos [?]: 0 [0]
Given Kudos: 17
Send PM
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   28 Jun 2022, 05:14
smilesingh wrote:
Bunuel
I think we have to solve for m and f for option B. Because if the values of m and f comes out to be in fraction and not integer then the answer would be A and not D. Am in right?


I am definitely curious of this too. thanks
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92948
Own Kudos [?]: 619244 [1]
Given Kudos: 81609
Send PM
CAT Tests Forum Quiz Mode
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink] New post   28 Jun 2022, 05:21
1
Kudos
Expert Reply
keykers1 wrote:
smilesingh wrote:
Bunuel
I think we have to solve for m and f for option B. Because if the values of m and f comes out to be in fraction and not integer then the answer would be A and not D. Am in right?


I am definitely curious of this too. thanks


m and f there are the numbers of male and female students, so they cannot be fractions. If the system of equations in (2) were to give non-integer solutions for m and f, then it would mean that the question is flawed.
GMAT Club Bot
gmatclubot
Re: There are 35 students in a college lecture theater. What is the ratio [#permalink]
28 Jun 2022, 05:21
Moderator:
Bunuel
Math Expert
92948 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