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

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Manager
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At a certain hospital, 75% of the interns receive fewer than [#permalink]

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New post 25 Aug 2007, 22:01
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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.

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Director
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Schools: University of Chicago, Wharton School
Re: PS [#permalink]

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New post 25 Aug 2007, 23:23
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, 23:44, edited 1 time in total.

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VP
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Re: PS [#permalink]

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New post 25 Aug 2007, 23:25
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.

Kudos [?]: 350 [0], given: 0

Re: PS   [#permalink] 25 Aug 2007, 23:25
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