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Is the number of members of Club X greater than the number

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B
Status: IF YOU CAN DREAM IT, YOU CAN DO IT
Joined: 03 Jul 2017
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Concentration: Finance, International Business
Re: Is the number of members of Club X greater than the number [#permalink]

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New post 05 Jul 2017, 03:20
can someone please explain this to me. I have trouble understanding this

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Re: Is the number of members of Club X greater than the number [#permalink]

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New post 05 Jul 2017, 03:27

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Re: Is the number of members of Club X greater than the number [#permalink]

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New post 05 Aug 2017, 00:07
Hello Moderators,

Can you please Hide the highlighted part below using "Spoiler" option in the question please? Its just that this is a OG question and the additional text is giving away the approach that can be followed when attempting it with a timer.

TIA!


TomB wrote:
Is the number of members of Club X greater than the number of members of Club Y ?

(1) Of the members of Club X, 20 percent are also members of Club Y.
(2) Of the members of Club Y, 30 percent are also members of Club X.

can we use matrix approach for this question. every body is saying:
0.20x=0.30y
x/y=3/2 so x>y.

what i know is ratios are not enough to compare two quantities. I am very bad at Ratio and proportions. Please explain

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Kudos [?]: 34 [0], given: 122

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Joined: 02 Sep 2009
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Re: Is the number of members of Club X greater than the number [#permalink]

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New post 05 Aug 2017, 00:15
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Expert's post
susheelh wrote:
Hello Moderators,

Can you please Hide the highlighted part below using "Spoiler" option in the question please? Its just that this is a OG question and the additional text is giving away the approach that can be followed when attempting it with a timer.

TIA!


TomB wrote:
Is the number of members of Club X greater than the number of members of Club Y ?

(1) Of the members of Club X, 20 percent are also members of Club Y.
(2) Of the members of Club Y, 30 percent are also members of Club X.

can we use matrix approach for this question. every body is saying:
0.20x=0.30y
x/y=3/2 so x>y.

what i know is ratios are not enough to compare two quantities. I am very bad at Ratio and proportions. Please explain

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Kudos [?]: 128514 [1], given: 12179

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Re: Is the number of members of Club X greater than the number [#permalink]

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New post 17 Aug 2017, 19:52
sukeshap wrote:
TomB wrote:
Is the number of members of Club X greater than the number of members of Club Y ?

(1) Of the members of Club X, 20 percent are also members of Club Y.
(2) Of the members of Club Y, 30 percent are also members of Club X.

Take an example,
Both club are having 1000 members, 200 of club X is having membership in Y- Insufficient
300 of club Y is having membership in X- Insufficient
Both together is not giving any conclusion, so the answer is E.

Please correct me if I am wrong



If both clubs have 1000 members, x overlap=200,y overlap=300. Since x overlap=y overlap, so x if overlap is increased, then x starts becoming greater than 1000 or if y overlap is reduced then y starts becoming less than 1000. Either way x>y.

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Re: Is the number of members of Club X greater than the number   [#permalink] 17 Aug 2017, 19:52

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