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If x and y are positive integers, is x a multiple of y?

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If x and y are positive integers, is x a multiple of y? [#permalink]

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If x and y are positive integers, is x a multiple of y?

(1) 2x is a multiple of y.
(2) 2(y^2) + y = 2x
[Reveal] Spoiler: OA
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If x and y are positive integers, is x a multiple of y? [#permalink]

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Omar7235 wrote:
If x and y are positive integers, is x a multiple of y?

(1) 2x is a multiple of y.
(2) 2(y^2) + y = 2x



Answer must be B

(1) if x= 4 && y=2 then YES
if x=3 && y=2 then NO

(2) y(2y+1)=2x
two options
(a) if y =odd
then 2y+1 is odd
then odd*odd never equals 2*odd

(2)y=even
then 2y+1 =odd
even*odd=even....satisfying
lets opt some values
if y=2 ,the least value ,then
2(y)*5(2y+1)= 2*5(x)...So we have x=5,y=2
for every y to be even , x must be odd
it is not a multiple..

suff

Ans B
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Re: If x and y are positive integers, is x a multiple of y? [#permalink]

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If x and y are positive integers, is x a multiple of y?

Is \(\frac{x}{y}=integer\)?

(1) 2x is a multiple of y --> \(\frac{2x}{y}=integer\) --> \(\frac{x}{y}=\frac{integer}{2}\). If that integer is even then the answer will be YES but if that integer is odd then the answer will be NO (for example, consider x=2 and y=2 AND x=1 and y=2). Not sufficient.

(2) 2(y^2) + y = 2x --> divide by 2y: \(y + \frac{1}{2} = \frac{x}{y}\). Thus \(\frac{x}{y}=y+ \frac{1}{2}=integer+noninteger=noninteger\). Sufficient.

Answer: B.
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Re: If x and y are positive integers, is x a multiple of y? [#permalink]

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New post 25 Mar 2017, 05:58
Omar7235 wrote:
If x and y are positive integers, is x a multiple of y?

(1) 2x is a multiple of y.
(2) 2(y^2) + y = 2x


Similar questions to practice:
https://gmatclub.com/forum/if-x-and-y-a ... 20420.html
https://gmatclub.com/forum/if-x-and-y-a ... 89048.html
https://gmatclub.com/forum/if-x-and-y-a ... 10085.html
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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If x and y are positive integers, is x a multiple of y? [#permalink]

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New post 26 Mar 2017, 01:31
Bunuel wrote:
(2) 2(y^2) + y = 2x --> divide by 2y: \(y + \frac{1}{2} = \frac{x}{y}\). Thus \(\frac{x}{y}=y+ \frac{1}{2}=integer+noninteger=noninteger\). Sufficient.

Answer: B.



Dear Bunuel,

You have divided by 2y because it is mentioned that y is positive integer so we are certain that there is possibility to equal Zero.

Am I right?

Thanks
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Re: If x and y are positive integers, is x a multiple of y? [#permalink]

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New post 26 Mar 2017, 04:07
Mo2men wrote:
Bunuel wrote:
(2) 2(y^2) + y = 2x --> divide by 2y: \(y + \frac{1}{2} = \frac{x}{y}\). Thus \(\frac{x}{y}=y+ \frac{1}{2}=integer+noninteger=noninteger\). Sufficient.

Answer: B.



Dear Bunuel,

You have divided by 2y because it is mentioned that y is positive integer so we are certain that there is possibility to equal Zero.

Am I right?

Thanks

_______________
Yes.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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If x and y are positive integers, is x a multiple of y? [#permalink]

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New post 26 Mar 2017, 04:41
Omar7235 wrote:
If x and y are positive integers, is x a multiple of y?

(1) 2x is a multiple of y.
(2) \(2y^2 + y = 2x\)


Dear Omar7235, Could you please quote the source of the question? Thank you. :-D
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If x and y are positive integers, is x a multiple of y?   [#permalink] 26 Mar 2017, 04:41
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