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09 Dec 2004, 04:08
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What is the greatest common factor of the positive integers x and y?
(1) y = x + 1
(2) xy is divisible by 5.
Can anyone explain how to solve this?
(1) y = x + 1
(2) xy is divisible by 5.
Can anyone explain how to solve this?
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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09 Dec 2004, 05:51
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A
S1: x and y are consecutive positive integers so the gcf is 1 -> S1 is sufficient
S2: For xy to be divisible by 5, either x or y has to be a multiple of 5.
pick numbers,
x = y = 5 -> gcf=5
x = 5 and y=1 -> gcf = 1
S2 is insufficient
S1: x and y are consecutive positive integers so the gcf is 1 -> S1 is sufficient
S2: For xy to be divisible by 5, either x or y has to be a multiple of 5.
pick numbers,
x = y = 5 -> gcf=5
x = 5 and y=1 -> gcf = 1
S2 is insufficient
09 Dec 2004, 07:18
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A for me too.
state 1- consecutive integers have only 1 as common factor. hence, gcf=1
statement 2- xy=20 /10/35
hence the values of x and y change accordingly and so does theor GCF. hence, insuff.
state 1- consecutive integers have only 1 as common factor. hence, gcf=1
statement 2- xy=20 /10/35
hence the values of x and y change accordingly and so does theor GCF. hence, insuff.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
