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# Rule of three - Conceptual question

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Manager
Joined: 11 Aug 2012
Posts: 125

Kudos [?]: 135 [0], given: 16

Schools: HBS '16, Stanford '16
Rule of three - Conceptual question [#permalink]

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17 Dec 2012, 15:20
I know that I have to use the "rule of three" when the relationship between the variables is direct and proportional. Identifying that the relationship is direct is easy; however, I don't know how to be sure that that the relationship is proportional. Is there a method or tecnique to confirm that?

For example,
If 7 candies represent the 35% of a bag of candies, how many candies are in the bag?
Common sense tells me that I have to use the rule of three:

7 ----- 35
x ----- 100

x = 20

Although that's the correct answer I was not sure that the relationship is proportional. How to confirm that in this problem and in more complex questions?
Thanks!

Kudos [?]: 135 [0], given: 16

Director
Status: Tutor - BrushMyQuant
Joined: 05 Apr 2011
Posts: 622

Kudos [?]: 768 [0], given: 59

Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 700 Q51 V31
GPA: 3
WE: Information Technology (Computer Software)
Re: Rule of three - Conceptual question [#permalink]

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17 Dec 2012, 21:52
danzig wrote:
I know that I have to use the "rule of three" when the relationship between the variables is direct and proportional. Identifying that the relationship is direct is easy; however, I don't know how to be sure that that the relationship is proportional. Is there a method or tecnique to confirm that?

For example,
If 7 candies represent the 35% of a bag of candies, how many candies are in the bag?
Common sense tells me that I have to use the rule of three:

7 ----- 35
x ----- 100

x = 20

Although that's the correct answer I was not sure that the relationship is proportional. How to confirm that in this problem and in more complex questions?
Thanks!

I will say if you can write something in the form

If k1 times x imples y
Then k2 times x implies ???

What I mean to say is if you can write something in the form

If some part of something(say x) implies something (say y)
Then some other part of something (x) implies ???

Good luck.
_________________

Ankit

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Kudos [?]: 768 [0], given: 59

Re: Rule of three - Conceptual question   [#permalink] 17 Dec 2012, 21:52
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