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# Company A has x mailing lists and Company B has y mailing lists. If th

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6985
GMAT 1: 760 Q51 V42
GPA: 3.82
Company A has x mailing lists and Company B has y mailing lists. If th  [#permalink]

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14 Jun 2016, 08:05
1
9
00:00

Difficulty:

(N/A)

Question Stats:

54% (02:12) correct 46% (02:08) wrong based on 141 sessions

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Company A has x mailing lists and Company B has y mailing lists. If the total mailing lists’ number combined Company A and Company B is equal to 3 times the mailing lists’ number of Company A, what is the number of mailing lists that both Company A and Company B have, in terms of x and y?
A. 2x-y
B. y-2x
C. 3x+y
D. y+2x
E. y-3x

*An answer will be posted in 2 days.

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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"Only $149 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Intern Joined: 16 Jul 2014 Posts: 19 Location: United Arab Emirates Re: Company A has x mailing lists and Company B has y mailing lists. If th [#permalink] ### Show Tags 16 Jun 2016, 07:01 1 1 a - lists that are only part of Company A ( A not B ) b - lists that are only part of Company B ( B not A ) c - lists that are part of both company A & B ( This is the overlap portion of the venn diagram) X mailing lists = a + c Y mailing lists = b + c Total = X + Y - Both = a+c + b+c - c = a+b+c As per the question a+b+c = 3(a+c) --> b = 2(a + c) --> b = 2X Y = 2X + c c = Y-2X _________________ KUDOS is great way to help those who have helped you. THE KILL SET - 700 level Sets quetions Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6985 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: Company A has x mailing lists and Company B has y mailing lists. If th [#permalink] ### Show Tags 16 Jun 2016, 19:22 (x-b)+b+(y-b)=3x, x+y-b=3x , therefore b=y-2x. Hence, the correct answer is B. Attachments 1.png [ 13.03 KiB | Viewed 1444 times ] _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$149 for 3 month Online Course"
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Re: Company A has x mailing lists and Company B has y mailing lists. If th  [#permalink]

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24 Oct 2018, 14:02
MathRevolution wrote:
Company A has x mailing lists and Company B has y mailing lists. If the total mailing lists’ number combined Company A and Company B is equal to 3 times the mailing lists’ number of Company A, what is the number of mailing lists that both Company A and Company B have, in terms of x and y?
A. 2x-y
B. y-2x
C. 3x+y
D. y+2x
E. y-3x

$$?\,\, = {\rm{both}}\,\,\, = \,\,\,f\left( {x,y} \right)$$

$$x + y - {\rm{both}} = 3x\,\,\,\,\,\,\left[ {\,{\rm{simplifier}}\,} \right]\,\,\,\,\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,\,\,\,?\,\, = \,\,y - 2x\,\,\,\,\,$$

This solution follows the notations and rationale taught in the GMATH method.

Regards,
Fabio.
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Intern
Joined: 04 Apr 2018
Posts: 21
Re: Company A has x mailing lists and Company B has y mailing lists. If th  [#permalink]

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30 Oct 2018, 01:11
Hi MathRevolution

The sentence "If the total mailing lists’ number combined Company A and Company B is equal to 3 times the mailing lists’ number of Company A" was quite ambiguous for me.
After giving it some thought, I understood the answer, but I'm not sure I wont repeat my mistake.
Could you please tell me where I got wrong if I read it as X+Y=3X?

Thank you!
Re: Company A has x mailing lists and Company B has y mailing lists. If th   [#permalink] 30 Oct 2018, 01:11
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