GMAT Data Sufficiency Discussions

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The GMAT and Related Discussions section is very fragmented in terms of the information available at one's disposal. There are one of reply threads and several other redundant threads that have masked the more important ones. This is an atte...
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6 students p,q,r,s,t and u belong to three different sections of a class. Exactly 2 students belong to each section . they are made to stand in a row such that two students of the same section are not standing together . two of the possible arrangements are : p,q,r,s,t,u and q,s,u,t,p,r . Which of the following pairs, the two students cannot be from the same section? 1) p ,u 2) r,t 3) s,p 4) u,q

@indrani
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As i'm interested in FPM, I have decided to go for GMAT. My overall academic is 80% from 10th to Post graduation (M.Pharmacy).I am GATE qualified. I am 31.I have 2 years of work experience. But I have carreer gap of 2 years as I have a 2 year old. Currently workingworking in MNC. I want to know what are my chances of ending up in IIMs, if I manage a good GMAT score? Please comment. It would be a great help.

Thanks

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2582
@2582  ·  3 karma

@DivyankaS Thank you. 

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mbajack
@mbajack  ·  0 karma

Isn't this the DS forum?

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The average (arithmetic mean) N numbers is M. When the number x is removed, the average decreases by 3. What is the value of x? 

1) M + 3N = 21

2) N = 2M

Answer is here -

http://www.gmatprepnow.com/module/gmat-statistics/video/819 

I thought you need 2 equations with 2 unknowns

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mbajack
@mbajack  ·  0 karma

Don't you need 2 equations??

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WiziusCareers
@WiziusCareers  ·  0 karma

Hi

For any question on averages, it is a good idea to apply the formula as many times as the word "mean" appears in the question.

From the question:

Sum/N = M    => Sum = MN

When x is removed, the sum of numbers will be Sum - x.

(Sum - x)/(N - 1) = M - 3


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