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In Teetown 50 percent of the people have blue eyes and blond hair.

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In Teetown 50 percent of the people have blue eyes and blond hair. [#permalink]

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New post 29 Oct 2017, 01:00
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In Teetown 50 percent of the people have blue eyes and blond hair. What percent of the people in Teetown have blue eyes but do not have blond hair?

(1) 70 percent of the people in Teetown have blond hair.
(2) 60 percent of the people in Teetown have blue eyes.
[Reveal] Spoiler: OA

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In Teetown 50 percent of the people have blue eyes and blond hair. [#permalink]

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New post 29 Oct 2017, 08:11
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The answer to the following question is B. I have solved the following problem by matrix method.

The following are the notations in the attached document.

BE: Blue Eyes
NBE: Not Blue Eyes
BH: Blond Hair
NBH: Not Blond Hair
Attachments

IMG_3803.JPG
IMG_3803.JPG [ 1.38 MiB | Viewed 370 times ]


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Re: In Teetown 50 percent of the people have blue eyes and blond hair. [#permalink]

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New post 19 Nov 2017, 01:33
1) 70% have blond hair. 70 - 50 = 20% have blond hair and non blue eyes. 30 % non blond hair. Overall NS

2) 60% have blue eyes. 40% have non blue eyes. if 50% are blond and blue, then 60 - 50 = 10% have blue eyes and non blond hair.

B is suff.
Kudos, please if you like this explanation :)

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Re: In Teetown 50 percent of the people have blue eyes and blond hair. [#permalink]

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New post 19 Nov 2017, 07:02
Bunuel wrote:
In Teetown 50 percent of the people have blue eyes and blond hair. What percent of the people in Teetown have blue eyes but do not have blond hair?

(1) 70 percent of the people in Teetown have blond hair.
(2) 60 percent of the people in Teetown have blue eyes.


Hi Bunuel,

Can you please help to clarify the below doubt.

Let the Total Number of People in Teetown be X.
a = Only Blue Eye.
b = Only Blond Hair.
c = Both Blue Eye & Blond Hair.

Is it right to write a + b + c = X? or we need to consider that there might be few people without Blue Eye & Blond Hair.
If a + b + c = X, then should D be the answer??

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Re: In Teetown 50 percent of the people have blue eyes and blond hair.   [#permalink] 19 Nov 2017, 07:02
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In Teetown 50 percent of the people have blue eyes and blond hair.

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