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# Of the families in a certain community, 75% have an oven,

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Senior Manager
Joined: 14 Jul 2006
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Of the families in a certain community, 75% have an oven, [#permalink]  20 Aug 2006, 00:45
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(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 2 sessions
Of the families in a certain community, 75% have an oven, 62% have a dish drier. What percent of them have an oven but do not have dish drier?

1). 11% of the families have a dish drier but do not have an oven.
2). The number of the families that have both is three times that of the families that have neither.

Shouldnt the answer to this question be D. In the question bank it said that 2 gave a number not a percentage. So the answer it gave was A

I think for number 2 you can assign variables that eventually can be cancelled out.
let N be number of families
let Y% be the percentage of families which does not have an oven nor a dish dryer

100%n-y%n=75%n+62%n-3y%n--> N can be cancelled thus leaving one variable. Am i correct?
CEO
Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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You are right for statement 1 but statement 2 gives you the NUMBER not the percentage and all other information is in percentages. Either everything should be in percentages or should be in numbers.
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Director
Joined: 17 Jul 2006
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Statement 1 gives the percentage which is required. i.e 26 percent.

Statement 2 is insuff

Ans A
Intern
Joined: 11 Jul 2006
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I think it should be A
Number cannoty have a percentage equivalent.
n(O) = 75%
n(D) = 62%
Watch this step :
Let the number of people haing both be 3x ~ 3y% - wrong assumption ..

Number of people cannot be proportional to percentage of people

IT IS A
VP
Joined: 02 Jun 2006
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Yep... agree with A...

Number does not indicate percentage...

Cannot compute percentage based on the two numbers given...
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