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If 40% of unsuccessful suicide attempts are repeated within

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Manager
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If 40% of unsuccessful suicide attempts are repeated within [#permalink]

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New post 30 Oct 2008, 07:14
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Pls explain your answer. Thanks.

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Manager
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Re: math query [#permalink]

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New post 30 Oct 2008, 07:53
Unsuccessful suicide rate = 75%
40% of 75% i.e 40/100* 75=30% are repeated within first 6 months
So the unrepeated first attempts are =100-30= 70%
So E is the ans

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Re: math query [#permalink]

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New post 30 Oct 2008, 08:02
gameCode 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

Pls explain your answer. Thanks.


S = 25%
U = 75%
R = 40% of 75% = 30%

REPEATED/SUCESSFUL = 25% of 30% = 7.5%
First attempt sucessful = 25% - 7.5% = 17.5% which is also 25% of the first attempt
so first attempt = 17.5%/0.25 = 70%
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Re: math query [#permalink]

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New post 30 Oct 2008, 08:08
Thanks for the reply. The QA is 70 . I got confused because i thought 25 % are unsuccessful out of the 40 % that retried. Whereas, its the 25 % of the total candicates are unsuccessful. The language in these kind of qs always confuses me.

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Re: math query   [#permalink] 30 Oct 2008, 08:08
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