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Gmat Quantitative question

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Gmat Quantitative question  [#permalink]

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New post 04 Jan 2018, 21:03
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It's correct answer is A.
But i think it should be D.
Can anybody explain plz?

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Re: Gmat Quantitative question [#permalink]

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New post 04 Jan 2018, 22:08
Insert value of x as "2" then you get

3*4+7*2= 28

28/2

Insert value of "3"

3*9+7*3= 48

48/3=16

Every time x is a multiple of y

Hence A is correct, IMHO



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Re: Gmat Quantitative question [#permalink]

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New post 04 Jan 2018, 22:31
X square - x is a multiple of y

9 - 3 = 6

6 is a multiple of y

Which can be 2,3 and 6 : not sufficient

49-7=42

42 is a multiple of y which can be 42,21, 6,7 not sufficient


IMHO, I hope I helped



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Re: Gmat Quantitative question  [#permalink]

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New post 04 Jan 2018, 22:48
3y^2 +7y=x can be written as y(3y+7)=x which is denoted as x=ky but second equation is written as x(x-1)= ky which does not clearly state the relation between x and y

Kudos if understood!!!

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Re: Gmat Quantitative question [#permalink]

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New post 05 Jan 2018, 15:49
Hi rajbeersingh717,

For future reference, you should post GMAT questions into their specific sub-forums. For example, the DS sub-forum can be found here:

https://gmatclub.com/forum/data-sufficiency-ds-141/

In addition, many of the GMAT questions that you might interested in have already been discussed in the forums here. This specific DS question can be found here:

https://gmatclub.com/forum/if-x-and-y-a ... 26736.html

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Re: Gmat Quantitative question   [#permalink] 05 Jan 2018, 15:49
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