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

 It is currently 05 May 2015, 06:24

# Expecting Soon:

Wharton Round 3 Decisions.   |   Join Chat Room for Live Updates

### 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

# M07: Q25

Author Message
Intern
Joined: 10 Jan 2008
Posts: 39
Followers: 0

Kudos [?]: 3 [0], given: 0

M07: Q25 [#permalink]  25 Aug 2008, 18:36
If 40% of unsuccessful suicide attempts are repeated within 6 months and 25% of suicides are successful, what percentage of suicides in any 6 months period is the first attempt?

30
40
50
60
70

I keep getting 77. Out of 100 initial attempts, 75 un succ. Out of these 75, 40% are attempted again, or 30. Out of the these 30 attempts, 7.5 are successful. When they say suicides, they mean successful ones right? If so, there are 25 + 7.5 total, or 32.5. 25/32.5 = appr 77 %

I think I'm missing something. Can anyone show how to get the OA, 70? Thanks
SVP
Joined: 30 Apr 2008
Posts: 1892
Location: Oklahoma City
Schools: Hard Knocks
Followers: 34

Kudos [?]: 468 [0], given: 32

Re: M07: Q25 [#permalink]  26 Aug 2008, 04:43
Aren't 100% of suicides "successful" otherwise they'd be attempted suicides?

tamg08 wrote:
If 40% of unsuccessful suicide attempts are repeated within 6 months and 25% of suicides are successful, what percentage of suicides in any 6 months period is the first attempt?

30
40
50
60
70

I keep getting 77. Out of 100 initial attempts, 75 un succ. Out of these 75, 40% are attempted again, or 30. Out of the these 30 attempts, 7.5 are successful. When they say suicides, they mean successful ones right? If so, there are 25 + 7.5 total, or 32.5. 25/32.5 = appr 77 %

I think I'm missing something. Can anyone show how to get the OA, 70? Thanks

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a.

GMAT Club Premium Membership - big benefits and savings

Intern
Joined: 10 Jan 2008
Posts: 39
Followers: 0

Kudos [?]: 3 [0], given: 0

Re: M07: Q25 [#permalink]  26 Aug 2008, 10:41
I would assume so. ha ha. Even if you look at attempts though, it would be still be 77%, 100/130 = apprx .77.
SVP
Joined: 07 Nov 2007
Posts: 1828
Location: New York
Followers: 29

Kudos [?]: 541 [0], given: 5

Re: M07: Q25 [#permalink]  27 Aug 2008, 11:08
tamg08 wrote:
If 40% of unsuccessful suicide attempts are repeated within 6 months and 25% of suicides are successful, what percentage of suicides in any 6 months period is the first attempt?

30
40
50
60
70

I keep getting 77. Out of 100 initial attempts, 75 un succ. Out of these 75, 40% are attempted again, or 30. Out of the these 30 attempts, 7.5 are successful. When they say suicides, they mean successful ones right? If so, there are 25 + 7.5 total, or 32.5. 25/32.5 = appr 77 %

I think I'm missing something. Can anyone show how to get the OA, 70? Thanks

Think in this way..
assume 100 sucide attemps..
25 successful 75 unsuccessfull.
40% of unsuccessful suicide attempts are repeated =40% sucide attempts are second attempt = 30

% first atttempt = 100-30 =70%
_________________

Smiling wins more friends than frowning

Senior Manager
Joined: 10 Dec 2008
Posts: 484
Location: United States
GMAT 1: 760 Q49 V44
GPA: 3.9
Followers: 33

Kudos [?]: 138 [0], given: 12

Re: M07: Q25 [#permalink]  27 Jul 2009, 08:23
Quote:

Think in this way..
assume 100 sucide attemps..
25 successful 75 unsuccessfull.
40% of unsuccessful suicide attempts are repeated =40% sucide attempts are second attempt = 30

% first atttempt = 100-30 =70%

I don't agree with this method, since it assumes that out of the 25 successful attempts, none of them were re-attempts. It only considers the 75% unsuccessful, but for all we know, from the 25 successful attempts, a good portion of them may have been repeats.

I agree with the OA and kept getting 77%.

100 people = 100 attempts
25 successful, 75 not
75 not, 40% repeat = 35 repeats
35 repeats, 25% success = 7.5 success

so out of the total suicides, 32.5, 25 were first attempts or 77%.

Even if we lengthen the time,
100 people = 100 attempts
25 successful, 75 not
75 not, 40% repeat = 35 repeats
35 repeats, 25% success = 7.5 success, 27.5 not
27.5 not, 40% repeat = 11 repeats
11 repeats, 25% success = 2.75 successful

so out of the total suicides, 25+7.5+2.75 = 32.5, 32 were first attempts 77% were first attempts, i don't think it would ever converge to 70%.

so why isn't the answer 77
SVP
Joined: 29 Aug 2007
Posts: 2497
Followers: 57

Kudos [?]: 556 [0], given: 19

Re: M07: Q25 [#permalink]  27 Jul 2009, 19:11
bipolarbear wrote:
Quote:

Think in this way..
assume 100 sucide attemps..
25 successful 75 unsuccessfull.
40% of unsuccessful suicide attempts are repeated =40% sucide attempts are second attempt = 30

% first atttempt = 100-30 =70%

I don't agree with this method, since it assumes that out of the 25 successful attempts, none of them were re-attempts. It only considers the 75% unsuccessful, but for all we know, from the 25 successful attempts, a good portion of them may have been repeats.

I agree with the OA and kept getting 77%.

100 people = 100 attempts
25 successful, 75 not
75 not, 40% repeat = 35 repeats
35 repeats, 25% success = 7.5 success

so out of the total suicides, 32.5, 25 were first attempts or 77%.

Even if we lengthen the time,
100 people = 100 attempts
25 successful, 75 not
75 not, 40% repeat = 35 repeats
35 repeats, 25% success = 7.5 success, 27.5 not
27.5 not, 40% repeat = 11 repeats
11 repeats, 25% success = 2.75 successful

so out of the total suicides, 25+7.5+2.75 = 32.5, 32 were first attempts 77% were first attempts, i don't think it would ever converge to 70%.

so why isn't the answer 77

Attempts = 100
Successful = 25
Un-successful = 75
Repeat = 40% of unsucessful = .4x75 = 30

New attempt = 100 - 30 = 70
_________________
SVP
Joined: 29 Aug 2007
Posts: 2497
Followers: 57

Kudos [?]: 556 [0], given: 19

Re: M07: Q25 [#permalink]  27 Jul 2009, 19:20
tamg08 wrote:
If 40% of unsuccessful suicide attempts are repeated within 6 months and 25% of suicides are successful, what percentage of suicides in any 6 months period is the first attempt?

30
40
50
60
70

I keep getting 77. Out of 100 initial attempts, 75 un succ. Out of these 75, 40% are attempted again, or 30. Out of the these 30 attempts, 7.5 are successful. When they say suicides, they mean successful ones right? If so, there are 25 + 7.5 total, or 32.5. 25/32.5 = appr 77 %

I think I'm missing something. Can anyone show how to get the OA, 70? Thanks

Probably any is not correct here. Any includes the first month in which all (100%) sucides are first attempt.
_________________
Manager
Joined: 22 Jul 2009
Posts: 193
Followers: 4

Kudos [?]: 210 [0], given: 18

Re: M07: Q25 [#permalink]  30 Sep 2009, 13:40
There is no initial month on this problem. Given that it asks for percentages, the word "any" is not relevant, as the percentage will be the same for any period.

The question does not ask "what percentage of attempted suicides in any 6 months period is a first attempt?".

It asks "what percentage of suicides in any 6 months period is a first attempt?".

Therefore, the official explanation is wrong.

Attempts = 100
Successful = 25
Un-successful = 75
Repeat = 40% of unsuccessful = .4x75 = 30
Succesful repeats = 25% of 30 = 7.5

1st attempt successful / total suicides = 1st attempt successful / (1st attemp successful + 2nd attempt successful) = 25 / (25 + 7.5) = 77%

This question should be revised.

Cheers
_________________

Please kudos if my post helps.

Current Student
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2801
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 194

Kudos [?]: 1117 [0], given: 235

Re: M07: Q25 [#permalink]  11 Jul 2010, 03:09
It should be 77 as explained above.
This question really needs revision.
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned

Jo Bole So Nihaal , Sat Shri Akaal

GMAT Club Premium Membership - big benefits and savings

Gmat test review :
670-to-710-a-long-journey-without-destination-still-happy-141642.html

Intern
Joined: 13 Jan 2010
Posts: 23
Followers: 1

Kudos [?]: 6 [0], given: 10

Re: M07: Q25 [#permalink]  02 Aug 2010, 05:32
I have some trouble understanding the solution. Please see my reasoning below and advice.

Assume that in each 6 month period the first time attempts are 100.
In the first attempt -
Attempt - 100
Successful - 25
Unsuccessful - 75

In the second attempt -
Attempt = 100 + 30 (40% of Unsuccessful from previous attemp) = 130
Successful - 32.5
Unsuccessful - 97.5

First time attempts as a percentage = (130-30)/130 * 100 = 77%

The OA assumes that 100 attempts in the second attempt include re attempts as well. Is it right?
Manager
Affiliations: The Earth organization, India
Joined: 25 Dec 2010
Posts: 193
WE 1: SAP consultant-IT 2 years
WE 2: Entrepreneur-family business 2 years
Followers: 5

Kudos [?]: 11 [0], given: 12

Re: M07: Q25 [#permalink]  02 Jun 2011, 09:17
_________________

Cheers !!

Quant 47-Striving for 50
Verbal 34-Striving for 40

Re: M07: Q25   [#permalink] 02 Jun 2011, 09:17
Similar topics Replies Last post
Similar
Topics:
11 m07, #10 22 04 Nov 2008, 21:13
20 M07 #2 15 25 Sep 2008, 10:35
3 m07 q33 10 08 Sep 2008, 10:39
6 m07 #22 19 03 Sep 2008, 18:41
1 m07q18 16 23 Jul 2008, 04:58
Display posts from previous: Sort by

# M07: Q25

Moderators: Bunuel, WoundedTiger

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.