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If x and y are points on the number line, what is the value

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Senior Manager
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If x and y are points on the number line, what is the value [#permalink] New post 17 Nov 2007, 11:26
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

50% (02:39) correct 50% (00:33) wrong based on 3 sessions
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
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Re: DS: x and y are points on the number line [#permalink] New post 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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 [#permalink] New post 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

the answer is (C)

:)
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Re: DS: x and y are points on the number line [#permalink] New post 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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 [#permalink] New post 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.

Answer should be A.
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Re: DS: x and y are points on the number line [#permalink] New post 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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 [#permalink] New post 17 Nov 2007, 15:27
uh oh! could the great killersquirell be wrong!

I can feel myself growing stronger!
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 [#permalink] New post 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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 [#permalink] New post 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 :P
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 [#permalink] New post 17 Nov 2007, 17:21
Yes , that's why he will never score 800, only 790
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 [#permalink] New post 17 Nov 2007, 21:35
This is definitely going into my error log. :oops:

Nice catch yashchenko !

:)
  [#permalink] 17 Nov 2007, 21:35
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If x and y are points on the number line, what is the value

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