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If x and y are positive integers and x = 3y, what is the value of x ?

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Intern
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Joined: 04 Feb 2018
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Location: United States
Schools: Zicklin "20 (S)
GMAT 1: 450 Q30 V30
GPA: 3.5
If x and y are positive integers and x = 3y, what is the value of x ?  [#permalink]

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New post Updated on: 26 May 2018, 13:54
4
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

60% (00:48) correct 40% (01:10) wrong based on 60 sessions

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If x and y are positive integers and x = 3y, what is the value of x ?

(1) y < 10
(2) x < 5

I thought the answer was B b/c x and y are both positive and it's only when x = 3 it makes sense. The answer was C though. Could anyone please explain? Thanks!

Originally posted by Lattepuccino on 26 May 2018, 11:06.
Last edited by Bunuel on 26 May 2018, 13:54, edited 2 times in total.
Renamed the topic, edited the question and added the OA.
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Re: If x and y are positive integers and x = 3y, what is the value of x ?  [#permalink]

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New post 26 May 2018, 13:37
Lattepuccino wrote:
If x and y are positive integers and x = 3y, what is the value of x ?

(1) y < 10
(2) x < 5

I thought the answer was B b/c x and y are both positive and it's only when x = 3 it makes sense. The answer was C though. Could anyone please explain? Thanks!



Given x and y are positive integer.
x = 3y that is x is multiple of 3

First statement says y< 10 that means it can take value from 1 to 9. so the value of x will be 3 to 27 which is not unique ,hence not sufficient

From Second statement x < 5 that means x can take value from 1 to 4 and from the question stem we know that x is the multiple of 3 and x and y both are positive integer so from this range only
x = 3 will satisfy the given condition, hence b is sufficient

Correct choice should be B
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Schools: Zicklin "20 (S)
GMAT 1: 450 Q30 V30
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Re: If x and y are positive integers and x = 3y, what is the value of x ?  [#permalink]

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New post 26 May 2018, 14:25
zishu912

Thank you so much!
The original answer shows >>>Now, evaluate Statement (2). Statement (2) provides that x < 5, and the question provides that x is a positive integer, so x could equal 1, 2, 3, or 4. When different numbers that satisfy a statement yield different answers to the question, the statement is insufficient. Eliminate choice B.

I was like,,,, "???? is y not supposed to be integer as well??" ...
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Re: If x and y are positive integers and x = 3y, what is the value of x ?  [#permalink]

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New post 25 Jun 2018, 19:38
1) y < 10

For every value of y we have a value of x
Multiple values so not sufficient

(2) x < 5
For y as integer only x=3 qualifies others not
B is sufficient And is answer

Give kudos if it helps

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Re: If x and y are positive integers and x = 3y, what is the value of x ?  [#permalink]

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New post 25 Jun 2018, 20:54
(1) x=27,24,21,18,15,12,9,6,3
Insufficient

(2) x=3
Sufficient

Answer B
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Re: If x and y are positive integers and x = 3y, what is the value of x ?  [#permalink]

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New post 26 Jun 2018, 10:01
Statement 2 is sufficient because x=3 is the only possibility is x < 5 to be a multiple of 3 i.e. y = 1.

Correct Answer is B
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Re: If x and y are positive integers and x = 3y, what is the value of x ? &nbs [#permalink] 26 Jun 2018, 10:01
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