Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 01 Oct 2016, 16:17

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Thirty percent of the members of a swim club have passed the

Author Message
TAGS:

### Hide Tags

Manager
Joined: 02 Dec 2012
Posts: 178
Followers: 4

Kudos [?]: 2001 [1] , given: 0

Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

20 Dec 2012, 08:51
1
KUDOS
3
This post was
BOOKMARKED
00:00

Difficulty:

5% (low)

Question Stats:

89% (02:20) correct 11% (01:31) wrong based on 656 sessions

### HideShow timer Statistics

Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

(A) 60
(B) 80
(C) 100
(D) 120
(E) 140
[Reveal] Spoiler: OA
Math Expert
Joined: 02 Sep 2009
Posts: 34909
Followers: 6515

Kudos [?]: 83238 [0], given: 10146

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

20 Dec 2012, 08:58
Expert's post
2
This post was
BOOKMARKED
Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

(A) 60
(B) 80
(C) 100
(D) 120
(E) 140

30% of the members have passed the test, thus 70% have not passed the test.

We also know that 30+12=42 members have not passed the test, thus 0.7*Total=42 --> Total=60.

_________________
Intern
Joined: 10 Nov 2013
Posts: 20
Location: United States
Concentration: Healthcare, Strategy
WE: Information Technology (Health Care)
Followers: 1

Kudos [?]: 11 [0], given: 130

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

30 Nov 2013, 21:58
Bunuel wrote:
Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

(A) 60
(B) 80
(C) 100
(D) 120
(E) 140

30% of the members have passed the test, thus 70% have not passed the test.

We also know that 30+12=42 members have not passed the test, thus 0.7*Total=42 --> Total=60.

The approach provided above can be used to solve this problem easily. however, i want to point out that this could also solved by using double sided set matrix method, similar to the problem which Bunuel explained at http://gmatclub.com/forum/of-30-applicants-for-a-job-14-had-at-least-4-years-144455.html#p1159040
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 11782
Followers: 529

Kudos [?]: 149 [0], given: 0

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

17 Feb 2015, 23:31
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 Legend
Joined: 09 Sep 2013
Posts: 11782
Followers: 529

Kudos [?]: 149 [0], given: 0

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

21 Apr 2016, 08:21
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.
_________________
Math Forum Moderator
Status: Moving Towards Perfection Now
Joined: 11 Jun 2011
Posts: 1355
Location: India
Schools: ISB
WE: Corporate Finance (Commercial Banking)
Followers: 43

Kudos [?]: 346 [2] , given: 239

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

21 Apr 2016, 11:32
2
KUDOS
Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

(A) 60
(B) 80
(C) 100
(D) 120
(E) 140

Draw a table as below -

Attachment:

Capture.PNG [ 4.33 KiB | Viewed 2308 times ]

Now check 70% = 42 (12+30)

If 70% = 42
Then 100% = 42/70 *100 => 60

So there are 60 people in the wsimming club.
_________________

Abhishek....

Senior Manager
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 251
Followers: 12

Kudos [?]: 57 [0], given: 2

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

27 Apr 2016, 09:32
Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

(A) 60
(B) 80
(C) 100
(D) 120
(E) 140

Solution:

We are given that 30 percent of the members of the have passed the lifesaving test. If we use variable T for the total number of members, we can say:

0.3T = number of members who passed the test

Since we know that 0.3T is the number of members who passed the test, we can determine that 0.7T members did not pass the test. Next we are given that among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. With this information we can set up the following equation:

12 + 30 = 0.7T

42 = 0.7T

420 = 7T

60 = T

Thus, there are 60 members in the swim club.

_________________

Jeffrey Miller
Jeffrey Miller

Intern
Joined: 12 Apr 2014
Posts: 9
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

19 Jun 2016, 23:49
the idea is to recognize the two parameters at extreme....passed-not passed....prep course-no prep course...make a table with them...insert the values in tables...solution will be automatically in front of you.
Senior Manager
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 286
Location: United States (CA)
Followers: 5

Kudos [?]: 47 [0], given: 0

Re: Thirty percent of the members of a swim club have passed the [#permalink]

### Show Tags

07 Jul 2016, 09:32
Thirty percent of the members of a swim club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. How many members are there in the swim club?

(A) 60
(B) 80
(C) 100
(D) 120
(E) 140

We are given that 30 percent of the members of the have passed the lifesaving test. If we use variable T for the total number of members, we can say:

0.3T = number of members who passed the test

Since we know that 0.3T is the number of members who passed the test, we can determine that 0.7T members did not pass the test. Next we are given that among the members who have not passed the test, 12 have taken the preparatory course and 30 have not taken the course. With this information we can set up the following equation:

12 + 30 = 0.7T

42 = 0.7T

420 = 7T

60 = T

Thus, there are 60 members in the swim club.

_________________

Jeffrey Miller
Scott Woodbury-Stewart
Founder and CEO

Re: Thirty percent of the members of a swim club have passed the   [#permalink] 07 Jul 2016, 09:32
Similar topics Replies Last post
Similar
Topics:
12 Last year 26 members of a certain club traveled to England, 26 members 12 15 Jun 2016, 01:35
2 Thirty percent of the women in a college class are science majors, and 1 24 Jan 2016, 05:49
2 Thirty percent of forty percent of fifty is sixty percent of what perc 4 11 Aug 2015, 14:28
8 If 30 percent of the members of a certain organization are 10 04 Jun 2014, 02:29
3 Two members of a club are to be selected to represent the 3 10 May 2012, 08:15
Display posts from previous: Sort by