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Of the companies surveyed about the skills they required in

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Of the companies surveyed about the skills they required in [#permalink] New post 14 Jun 2011, 03:52
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Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of companies required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but now computer skills.

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Re: companies surveyed [#permalink] New post 14 Jun 2011, 03:55
Look here for a detailed explanation :

ds-ques-66118.html
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Re: companies surveyed [#permalink] New post 14 Jun 2011, 04:51
table is
W !W
C 20 x a gives x=40
!C45 60

b gives 60-45 = 15 for !C !W.

C here.
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Re: companies surveyed [#permalink] New post 14 Jun 2011, 07:27
subhashghosh wrote:
Look here for a detailed explanation :

ds-ques-66118.html


Please complete the following solution:

Total = 100 = Computer Only + both (20)+ Writing only + Neither comp Nor writing.

1) Computer = Computer Only + both (20)
Writing = Writing only + both (20)

Computer = 2 * Writing

Insuff alone

2) Writing only = 45

Writing = 45 + 20 = 65

insuff alone remaining 100 - 65 = 35 can include Computer only and neither comp nor writing.

What should i do now to get neither comp nor writing?
Together
suff.
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Re: companies surveyed [#permalink] New post 14 Jun 2011, 09:45
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Baten80 wrote:
Of the companies surveyed about the skills they required in prospective employees, 20 percent required both computer skills and writing skills. What percent of companies required neither computer skills nor writing skills?

(1) Of those companies surveyed that required computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required writing skills but now computer skills.


C- Computer
W- Writing
T- Total
B-Both
N- Neither

OC-Only C
OW-Only W

T=C+W-B+N
100=C+W-20+N
N=120-C-W

(1)
B=1/2*C
C=2B=2*20=40----------------1
N=120-C-W
N=120-40-W
N=80-W----------------2
W-Unknown
Not Sufficient.

(2)
OW=45
W=B+OW=20+45=65-------------3
N=120-C-W
N=120-C-65
N=55-C-----------------4
C-Unknown;
Not Sufficient.

Using 1 and 4:
N=55-C=55-40=15
OR
Using 2 and 3:
N=80-W=80-65=15

Sufficient.

Ans: "C"
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Re: companies surveyed   [#permalink] 14 Jun 2011, 09:45
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