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If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 21:02
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If xy = 6, what is the value of xy(x+y)? (1) x  y = 5 (2) xy^2 = 18
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If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 21:42
If xy = 6, what is the value of xy(x+y)? (1) x  y = 5 So xy=6 and xy=5 or x=y+5, but we can have different values.. \(xy=6....(y+5)y=6....y^2+5y+6=0......y^2+2y+3y+6=0....(y+2)(y+3)=0\) So y can be 2, hence x=3 and \(xy(x+y)=6(32)=6\) y can be 3, hence x=2 and \(xy(x+y)=6(23)=6\) Insuff (2) \(xy^2 = 18...xy*y=18....6*y=18...y=3\) hence x=2 and \(xy(x+y)=6(23)=6\) Suff B
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Re: If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 21:44
1. (xy)^2= (x+y)^2 4xy (X+y)^2= 25+4xy = 254*6 = 2524=1 X+y =1 or x+y = 1 Not sufficient
2. Xy^2=18 Xy*y=18 6*y=18 Y=3 X=2 X+y=1 Sufficient Ans B
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If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 22:37
Quote: If xy = 6, what is the value of xy(x+y)?
(1) x  y = 5
(2) xy^2 = 18 HI chetan2u, VeritasKarishma, Bunuel, GMATBusters, GMATPrepNow, EgmatQuantExpert, GMATinsight , GMATGuruNY, MentorTutoringIs it not advisable to use the numbers in these kinds of problems? If xy = 6 there multiple possibilities with integers 6,1 & 2,3 with sign changes.Little but confused using algebra into the questions. Below is the link to the Gmatclub test question. https://gmatclub.com/forum/d01183504.html
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If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 23:20
It depends on how quick you are at numbers picking. for xy =  6, we can have (x,y) can be (1,6) , (6,1), (3,2), (2,3)... and many other values but (3,2), (2,3) satisfy St 1 : xy = 5 and (3,2), (2,3) gives 2 different answer for xy(x+y) So, St1 is not sufficient. Thus Number picking seems a bit more difficult. Also, I would recommend practicing more Algebra, because Algebra is unavoidable and will be used for other questions also. NandishSS wrote: Quote: If xy = 6, what is the value of xy(x+y)?
(1) x  y = 5
(2) xy^2 = 18 HI chetan2u, VeritasKarishma, Bunuel, GMATBusters, GMATPrepNow, EgmatQuantExpert, GMATinsight , GMATGuruNY, MentorTutoringIs it not advisable to use the numbers in these kinds of problems? If xy = 6 there multiple possibilities with integers 6,1 & 2,3 with sign changes.Little but confused using algebra into the questions. Below is the link to the Gmatclub test question. https://gmatclub.com/forum/d01183504.html
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Re: If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 23:51
HI RashedVai This question is discussed in the below link. Bunuel FYI https://gmatclub.com/forum/ifxy6what ... 67646.html
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Re: If xy = 6, what is the value of xy(x+y)?
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22 Feb 2020, 23:54
GMATBusters wrote: It depends on how quick you are at numbers picking. for xy =  6, we can have (x,y) can be (1,6) , (6,1), (3,2), (2,3)... and many other values but (3,2), (2,3) satisfy St 1 : xy = 5 and (3,2), (2,3) gives 2 different answer for xy(x+y) So, St1 is not sufficient. Thus Number picking seems a bit more difficult. Also, I would recommend practicing more Algebra, because Algebra is unavoidable and will be used for other questions also. NandishSS wrote: Quote: If xy = 6, what is the value of xy(x+y)?
(1) x  y = 5
(2) xy^2 = 18 HI chetan2u, VeritasKarishma, Bunuel, GMATBusters, GMATPrepNow, EgmatQuantExpert, GMATinsight , GMATGuruNY, MentorTutoringIs it not advisable to use the numbers in these kinds of problems? If xy = 6 there multiple possibilities with integers 6,1 & 2,3 with sign changes.Little but confused using algebra into the questions. Below is the link to the Gmatclub test question. https://gmatclub.com/forum/d01183504.htmlThank you GMATBusters , Will practice using Algebra as well
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Re: If xy = 6, what is the value of xy(x+y)?
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23 Feb 2020, 02:43
RashedVai wrote: If xy = 6, what is the value of xy(x+y)?
(1) x  y = 5
(2) xy^2 = 18 Discussed here: https://gmatclub.com/forum/ifxy6what ... 67646.html Hope it helps. THIS TOPIC IS LOCKED AND ARCHIVED.
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Re: If xy = 6, what is the value of xy(x+y)?
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23 Feb 2020, 02:43






