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# If x and y are integers and 2 < x < y, does y = 16 ?

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If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  09 Mar 2013, 12:06
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If x and y are integers and 2 < x < y, does y = 16 ?

(1) The GCF of X and Y is 2.
(2) The LCM of X and Y is 48.
[Reveal] Spoiler: OA
Current Student
Status: Final Lap Up!!!
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Kudos [?]: 396 [0], given: 69

Re: if x and y are integers and 2<x<y, does y =16 [#permalink]  09 Mar 2013, 12:09
I know that each statements are insufficient by itself. But i think Even taken together they are insufficient.
We know that GCF*LCM = X*Y
So X*Y = 96
Hence , when y = 24 , x =4
Similarly when y = 16 , x = 6
So i think both statements are insufficient taken together.

Archit
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Re: if x and y are integers and 2<x<y, does y =16 [#permalink]  09 Mar 2013, 12:26
Expert's post
Archit143 wrote:
If x and y are integers and 2 < x < y, does y = 16 ?

(1) The GCF of X and Y is 2.
(2) The LCM of X and Y is 48.

I know that each statements are insufficient by itself. But i think Even taken together they are insufficient.
We know that GCF*LCM = X*Y
So X*Y = 96
Hence , when y = 24 , x =4
Similarly when y = 16 , x = 6
So i think both statements are insufficient taken together.

Archit

Notice that the greatest factor of 24 and 4 is 4, not 2 as given in the second statement.

Hope it helps.
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Re: if x and y are integers and 2<x<y, does y =16 [#permalink]  19 Oct 2013, 19:07
Archit143 wrote:
I know that each statements are insufficient by itself. But i think Even taken together they are insufficient.
We know that GCF*LCM = X*Y
So X*Y = 96
Hence , when y = 24 , x =4
Similarly when y = 16 , x = 6
So i think both statements are insufficient taken together.

Archit

If GCF is 2 and LCM is 48, than the Pair of X and Y can be:
X=2,Y=48 and X=6,Y=16 and X=16, Y=6 and X=48, Y=2

[Reveal] Spoiler:
E
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Re: if x and y are integers and 2<x<y, does y =16 [#permalink]  20 Oct 2013, 03:36
2
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Expert's post
suk1234 wrote:
Archit143 wrote:
I know that each statements are insufficient by itself. But i think Even taken together they are insufficient.
We know that GCF*LCM = X*Y
So X*Y = 96
Hence , when y = 24 , x =4
Similarly when y = 16 , x = 6
So i think both statements are insufficient taken together.

Archit

If GCF is 2 and LCM is 48, than the Pair of X and Y can be:
X=2,Y=48 and X=6,Y=16 and X=16, Y=6 and X=48, Y=2

[Reveal] Spoiler:
E

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Re: If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  05 Nov 2013, 02:15
I am not getting the right answer for some reason. Can you please tell me the set of numbers for which both the statements are satisfied?

thank you.
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Re: If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  05 Nov 2013, 06:00
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Expert's post
emailmkarthik wrote:
If x and y are integers and 2 < x < y, does y = 16 ?

(1) The GCF of X and Y is 2.
(2) The LCM of X and Y is 48.

I am not getting the right answer for some reason. Can you please tell me the set of numbers for which both the statements are satisfied?

thank you.

x = 6 and y = 16 --> the greatest common factor of 6 and 16 is 2, and the least common multiple of 6 and 16 is 48.
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Re: If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  05 Nov 2013, 06:13
Thanks Bunuel. But I am a but unclear still. Is there another set of numbers that satisfy both statements? Else answer should be C, no?
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Re: If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  05 Nov 2013, 06:15
Expert's post
emailmkarthik wrote:
Thanks Bunuel. But I am a but unclear still. Is there another set of numbers that satisfy both statements? Else answer should be C, no?

Not sure what you mean...

The correct answer IS C: no other x and y satisfy both the stem and the statements.
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Re: If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  05 Nov 2013, 06:18
My goodness. Thank you so much! I thought the answer was E and I was very confused. I saw the answer of some post and assumed it to be OA.
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If x and y are integers and 2 < x < y, does y = 16? [#permalink]  06 Nov 2013, 09:59
If x and y are integers and 2 < x < y, does y = 16?

(1) The GCF of x and y is 2
(2) The LCM of x and y is 48
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Re: If x and y are integers and 2 < x < y, does y = 16? [#permalink]  06 Nov 2013, 18:05
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accincognito wrote:
If x and y are integers and 2 < x < y, does y = 16?

(1) The GCF of x and y is 2
(2) The LCM of x and y is 48

Dear accincognito,
I'm happy to help.

This is a hard problem! See this post for some insight:
http://magoosh.com/gmat/2012/gmat-math-factors/

Statement #1: The GCF of x and y is 2
This leave open a wide array of possibilities. All we know is that x and y are two even numbers, both bigger than 2, with no common factors other than two: they could be
x = 4, y = 6
x = 6, y = 8
x = 6, y = 10
x = 6, y = 16
So, it's possible for y to equal 16 or equal something else. This statement, alone and by itself, does not give us sufficient information, so it is insufficient.

Statement #2: The LCM of x and y is 48
Without any other information, we could have
x = 3, y = 16
x = 4, y = 48
So, it's possible for y to equal 16 or equal something else. This statement, alone and by itself, does not give us sufficient information, so it is insufficient.

Combined: this is where it gets interesting.
The GCF of x and y is 2
The LCM of x and y is 48
This is a tricky combination. First, let's list all the factors of 48 --- in order to have a LCM of 48 with another number, each number must be a factor of 48.
factors of 48 = {1, 2, 3, 4, 6, 8, 12, 16, 24, 48}
Those are the possible candidates for x & y. We can eliminate 1 & 2, because x > 2, and we can eliminate 3, because that cannot have a GCF of 2 with anything else.
Possibilities for x & y = {4, 6, 8, 12, 16, 24, 48}
If y = 48, then every other number in the set is factor of 48, so the GCF would be the smaller number --- e.g. the GCF of 6 and 48 is 6. Therefore, we can't use 48.
If y = 24, then the first four numbers are factors of 24, so they don't work, and the GCF of 16 & 24 is 8. Therefore, we can't use 24.
Possibilities for x & y = {4, 6, 8, 12, 16}
Suppose y = 16
x = 4, y = 16 ===> GCF = 4, doesn't work
x = 6, y = 16 ===> GCF = 2 --- this is one possible pair!!
x = 8, y = 16 ===> GCF = 8, doesn't work
x = 12, y = 16 ===> GCF = 4, doesn't work
Suppose y = 8
x = 4, y = 8 ===> GCF = 4, doesn't work
x = 6, y = 8 ===> GCF = 2, but LCM = 24, doesn't work
Suppose y = 6
x = 4, y = 6 ===> GCF = 2, but LCM = 12, doesn't work
So, after all that, the only pair that satisfies both statements is x = 6, y = 16, so it turns out, y does in fact equal 16. We are able to give a definitive answer to the prompt question, so the combined statements are sufficient.

Does all this make sense?
Mike
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Re: If x and y are integers and 2 < x < y, does y = 16? [#permalink]  31 Mar 2014, 07:20
mikemcgarry wrote:
accincognito wrote:
If x and y are integers and 2 < x < y, does y = 16?

(1) The GCF of x and y is 2
(2) The LCM of x and y is 48

Dear accincognito,
I'm happy to help.

This is a hard problem! See this post for some insight:
http://magoosh.com/gmat/2012/gmat-math-factors/

Statement #1: The GCF of x and y is 2
This leave open a wide array of possibilities. All we know is that x and y are two even numbers, both bigger than 2, with no common factors other than two: they could be
x = 4, y = 6
x = 6, y = 8
x = 6, y = 10
x = 6, y = 16
So, it's possible for y to equal 16 or equal something else. This statement, alone and by itself, does not give us sufficient information, so it is insufficient.

Statement #2: The LCM of x and y is 48
Without any other information, we could have
x = 3, y = 16
x = 4, y = 48
So, it's possible for y to equal 16 or equal something else. This statement, alone and by itself, does not give us sufficient information, so it is insufficient.

Combined: this is where it gets interesting.
The GCF of x and y is 2
The LCM of x and y is 48
This is a tricky combination. First, let's list all the factors of 48 --- in order to have a LCM of 48 with another number, each number must be a factor of 48.
factors of 48 = {1, 2, 3, 4, 6, 8, 12, 16, 24, 48}
Those are the possible candidates for x & y. We can eliminate 1 & 2, because x > 2, and we can eliminate 3, because that cannot have a GCF of 2 with anything else.
Possibilities for x & y = {4, 6, 8, 12, 16, 24, 48}
If y = 48, then every other number in the set is factor of 48, so the GCF would be the smaller number --- e.g. the GCF of 6 and 48 is 6. Therefore, we can't use 48.
If y = 24, then the first four numbers are factors of 24, so they don't work, and the GCF of 16 & 24 is 8. Therefore, we can't use 24.
Possibilities for x & y = {4, 6, 8, 12, 16}
Suppose y = 16
x = 4, y = 16 ===> GCF = 4, doesn't work
x = 6, y = 16 ===> GCF = 2 --- this is one possible pair!!
x = 8, y = 16 ===> GCF = 8, doesn't work
x = 12, y = 16 ===> GCF = 4, doesn't work
Suppose y = 8
x = 4, y = 8 ===> GCF = 4, doesn't work
x = 6, y = 8 ===> GCF = 2, but LCM = 24, doesn't work
Suppose y = 6
x = 4, y = 6 ===> GCF = 2, but LCM = 12, doesn't work
So, after all that, the only pair that satisfies both statements is x = 6, y = 16, so it turns out, y does in fact equal 16. We are able to give a definitive answer to the prompt question, so the combined statements are sufficient.

Does all this make sense?
Mike

No need to test that many cases, let's see

x,y are positive integers and 2<x<y. Is y=16?

First statement
GCF (x,y) is 2

Well we could have:

Hence insufficient

Second Statement
LCM (x,y) is 48
48 = 2^4 * 3

Now we can test cases here too: Either x=3 and y=2^4 when answer is YES
OR x=7 y = 48 answer is NO

Both together
Since GCF =2 and LCM = 48 and since 2<x<y we can only have x=6, y=16

Hence C is the correct answer
Cheers
J
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Re: If x and y are integers and 2 < x < y, does y = 16? [#permalink]  31 Mar 2014, 07:20
Again @Mike, No need for all the fuzz, let's see

x,y are positive integers and 2<x<y. Is y=16?

First statement
GCF (x,y) is 2

Well we could have:

Hence insufficient

Second Statement
LCM (x,y) is 48
48 = 2^4 * 3

Now we can test cases here too: Either x=3 and y=2^4 when answer is YES
OR x=7 y = 48 answer is NO

Both together
Since GCF =2 and LCM = 48 and since 2<x<y we can only have x=6, y=16

Hence C is the correct answer
Cheers
J

Last edited by jlgdr on 29 May 2014, 06:18, edited 1 time in total.
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Re: If x and y are integers and 2 < x < y, does y = 16 ? [#permalink]  01 Apr 2014, 19:57
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Archit143 wrote:
If x and y are integers and 2 < x < y, does y = 16 ?

(1) The GCF of X and Y is 2.
(2) The LCM of X and Y is 48.

Given: 2 < X < Y
Question: Does Y = 16?

(1) The GCF of X and Y is 2.
X = 2a; Y = 2b (a and b are co prime integers)
Y may or may not be 16 e.g. X = 6, Y = 16 OR X = 6, Y = 8 etc

(2) The LCM of X and Y is 48.
$$48 = 2^4 * 3$$
One of X and Y must have 2^4 = 16 as a factor and one must have 3 as a factor. Again, Y may or may not be 16 e.g. X = 6, Y = 16 OR X = 1, Y = 48 etc

Using both together, X = 2a, Y = 2b.
Since a and b need to be co-prime and both X and Y need to be greater than 2, one of a and b must be 3 and the other must be 8 (since X and Y already have a 2 to make 16).
X = 6, Y = 16 (since X is less than Y).
Y must be 16.

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Re: If x and y are integers and 2 < x < y, does y = 16 ?   [#permalink] 01 Apr 2014, 19:57
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