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At a certain hospital, 75% of the interns receive fewer than

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Senior Manager
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Joined: 13 May 2007
Posts: 252
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At a certain hospital, 75% of the interns receive fewer than [#permalink] New post 25 Aug 2007, 21:01
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At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

a. 6
b. 14
c. 19
d. 20
e. 81

Please show the working.
Director
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Joined: 03 May 2007
Posts: 899
Schools: University of Chicago, Wharton School
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Re: PS [#permalink] New post 25 Aug 2007, 22:23
empty_spaces wrote:
At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

a. 6
b. 14
c. 19
d. 20
e. 81

Please show the working.


hmmmmmm............
it real confusing..

= (80 - 75) + (70) (100-80)
= 5 + 14
= 19%

Last edited by Fistail on 25 Aug 2007, 22:44, edited 1 time in total.
VP
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Re: PS [#permalink] New post 25 Aug 2007, 22:25
empty_spaces wrote:
At a certain hospital, 75% of the interns receive fewer than 6 hours of sleep and report feeling tired during their shifts. At the same time, 70% of the interns who receive 6 or more hours of sleep report no feelings of tiredness. If 80% of the interns receive fewer than 6 hours of sleep, what percent of the interns report no feelings of tiredness during their shifts?

a. 6
b. 14
c. 19
d. 20
e. 81

Please show the working.


I didn't get any of the answer choices...got 34
Set Total = 100
More than or equal 6 hours of sleep = 20
Not Tried: 70/100 * 20 = 14

Less than 6 hours of sleep = 80
Not Tried: 25/100 * 80 = 20

Total Not Tried = 14+20 = 34
Don't know what's wrong.
Re: PS   [#permalink] 25 Aug 2007, 22:25
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