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If the successive tick marks shown on the number line above

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Manager
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Joined: 24 Aug 2009
Posts: 151
Followers: 3

Kudos [?]: 28 [0], given: 46

If the successive tick marks shown on the number line above [#permalink] New post 10 Dec 2009, 20:48
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B
C
D
E

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If the successive tick marks shown on the number
line above are equally spaced and if x and y are the
numbers designating the end points of intervals as
shown, what is the value of y ?
(1) x =
1
2
(2) y – x =
2
3
Arithmetic Properties of numbers
(1) If 3 tick marks represent a value of
1
2
, then
6 tick marks would represent a value of 1.
From this it can be established that each
subdivision of the line represents
1
6
, so the
value of y is
7
6
; SUFFICIENT.


From where did they get the information that 3 tick mark represents 1/2, why cant it represent 1/4 or even 1
VP
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Joined: 05 Mar 2008
Posts: 1477
Followers: 11

Kudos [?]: 195 [0], given: 31

GMAT Tests User
Re: GMAT OG12 sum - need help [#permalink] New post 10 Dec 2009, 21:00
ISBtarget wrote:
If the successive tick marks shown on the number
line above are equally spaced and if x and y are the
numbers designating the end points of intervals as
shown, what is the value of y ?
(1) x =
1
2
(2) y – x =
2
3
Arithmetic Properties of numbers
(1) If 3 tick marks represent a value of
1
2
, then
6 tick marks would represent a value of 1.
From this it can be established that each
subdivision of the line represents
1
6
, so the
value of y is
7
6
; SUFFICIENT.


From where did they get the information that 3 tick mark represents 1/2, why cant it represent 1/4 or even 1


Imagine 2 endpoints at x = 2 and y = 4...and there is one tickmark in between, let's call it z

that would mean 1/2 of x + y
same with the distance between 0 and 1 one tickmark in between is 1/2

one tickmark in between two numbers can't be 1/4 per tickmark
Re: GMAT OG12 sum - need help   [#permalink] 10 Dec 2009, 21:00
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If the successive tick marks shown on the number line above

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