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Prac Exam Number Line

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Prac Exam Number Line

by fangtray » Sun Apr 22, 2012 4:17 am
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

OA is A.

but why does A work? If 6 is halfway b/t x and Y, x could = 5 and y = 7 or x = 4 and y = 8....how does A work? what am i not understanding?
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by khandelwal.ab » Sun Apr 22, 2012 4:24 am
I think it should be C (if I understood the question correctly).

I don't like the language of the question though. What's the source?
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by fangtray » Sun Apr 22, 2012 7:02 am
khandelwal.ab wrote:I think it should be C (if I understood the question correctly).

I don't like the language of the question though. What's the source?
this is on the GMAT Prac Exam. so its an official quesiton. am i reading the problem incorrectly?
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by neelgandham » Sun Apr 22, 2012 7:03 am
fangtray wrote: but why does A work? If 6 is halfway b/t x and Y, x could = 5 and y = 7 or x = 4 and y = 8....how does A work? what am i not understanding?
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

Fangtray: I am sure that a lot of GMAT takers commit this mistake. The question doesn't ask you the value of (x,y). It asks you the value of x+y. Let me consider the (x,y) sets quoted by you.

If x = 5 and y = 7, then x+y = 12
If x = 4 and y = 8, then x+y = 12
If x = 2 and y = 10, then x+y = 12
if x = -1 and y = 13, then x+y = 12 and in all the cases, the number 6 lies between x and y. Indeed, the first statement can be rephrased to, '(x+y)/2 = 6' BECAUSE the midvalue of two numbers on the number line is the average of the two numbers.

Let me know, if you still find it tricky.

p.s: Please don't reveal the answer in the posts(First post). Use spoilers. How?, click here -> https://www.beatthegmat.com/new-spoilers-t5302.html
Anil Gandham
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