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

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

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20 Dec 2012, 08:51
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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
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Re: Thirty percent of the members of a swim club have passed the [#permalink]

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20 Dec 2012, 08:58
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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.

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

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

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17 Feb 2015, 23:31
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Re: Thirty percent of the members of a swim club have passed the [#permalink]

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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).

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

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21 Apr 2016, 11:32
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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 4869 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.
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Re: Thirty percent of the members of a swim club have passed the [#permalink]

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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.

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

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

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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.

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

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14 Mar 2017, 05:57
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

Common Sense Ans: 30% have passed that means 70% is 30+12 = 42
Therefore, 42*30 = 1260, 1260/70 = 18 i.e 30 % = 18;
Therefore, 18+ 42 = 60 (30%+70%)
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Re: Thirty percent of the members of a swim club have passed the [#permalink]

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18 May 2017, 13:32
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

Let total number of members be = X.
30% of X have passed the lifesaving test.
70% of X have failed the lifesaving test.
Out of those who failed the test 12 have taken the preparatory course and 30 have not taken the course.
Therefore 70% of X = 12 + 30 = 42
$$\frac{70}{100}$$ * X = 42
X = 42 * $$\frac{100}{70}$$ = 60

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Re: Thirty percent of the members of a swim club have passed the   [#permalink] 18 May 2017, 13:32
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