If x and y are points on the number line, what is the value : GMAT Data Sufficiency (DS)
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# If x and y are points on the number line, what is the value

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If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 11:26
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If x and y are points on the number line, what is the value of x + y?

(1) 6 is halfway between x and y

(2) y = 2x

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-x-and-y-are-two-points-on-the-number-line-what-is-the-85700.html
[Reveal] Spoiler: OA
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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 11:33
gluon wrote:
If x and y are points on the number line, what is the value of x + y?

(1) 6 is halfway between x and y

(2) y = 2x

1. x = 3 y=9 or x=0 y=12 thus not suff. (x.................6..................y)

2. y=2x, x=3 y=6 or x=4 y=8. not suff.

combined 1&2

x=4 y=8 thus x+y=12

C
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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 11:39
x+y = ?

statement 1

Lets assume x=3 and y=9 or x=2 and y=10

insufficient

statement 2

y=2x

2x+x = 3x

insufficient

both statements

3x/2 = 6

3x = 12

x = 4

4,6,8 ---> one solution ---> 4+8 = 12

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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 12:13
[quote="gluon"]If x and y are points on the number line, what is the value of x + y?

(1) 6 is halfway between x and y

(2) y = 2x[/quote]

I think it should be A.
If 6 is halfway, it means that X + Y / 2 = 6. means X + Y = 12
we can test it

x = 3 , means y = 9 x+y=12
x = -12, means y= 24 , again x+y =12
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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 15:17
I think it is A.

Killer, Statement A is suff. Look what you said:

statement 1

Lets assume x=3 and y=9 or x=2 and y=10

insufficient

3 + 9 =12
and
2+10 = 12

A tells us it will always equal 12.

B is insuff alone.

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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 15:25
gluon wrote:
If x and y are points on the number line, what is the value of x + y?

(1) 6 is halfway between x and y

(2) y = 2x

A

If 6 is half way between , then 6 has to be average of two numbers
so (x+y)/2 = 6 => x+y = 12

2 ) is redundant info..
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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 15:27
uh oh! could the great killersquirell be wrong!

I can feel myself growing stronger!
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Re: If x and y are points on the number line, what is the value [#permalink]

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17 Nov 2007, 15:28
hmm, the conclusion i made based on stat1 has already told that x+y=12. that's "nicely" paying attention to details

thanks guys. sorry gluon!
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17 Nov 2007, 16:29
I made the same mistake as Ravshonbek and KS

We tried to find values of x and y separately instead of (x + y)

The OA is indeed A.

So KS does make mistakes sometimes
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17 Nov 2007, 17:21
Yes , that's why he will never score 800, only 790
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17 Nov 2007, 21:35
This is definitely going into my error log.

Nice catch yashchenko !

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03 Jan 2015, 09:55
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Re: If x and y are points on the number line, what is the value [#permalink]

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05 Jan 2015, 03:29
If x and y are two points on the number line what is the value of x + y?

(1) 6 is halfway between x and y. On the GMAT we often see such statement and it can ALWAYS be expressed algebraically as $$6=\frac{x+y}{2}$$ --> $$x+y=12$$. Remember we are asked to determine the value of $$x+y$$ not $$x$$ and $$y$$. Sufficient.

(2) y=2x. Clearly not sufficient

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-x-and-y-are-two-points-on-the-number-line-what-is-the-85700.html
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Re: If x and y are points on the number line, what is the value   [#permalink] 05 Jan 2015, 03:29
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