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# If the successive tick marks shown on the number line above

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Manager
Joined: 24 Aug 2009
Posts: 149
If the successive tick marks shown on the number line above [#permalink]

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10 Dec 2009, 21:48
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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
Joined: 05 Mar 2008
Posts: 1469
Re: GMAT OG12 sum - need help [#permalink]

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10 Dec 2009, 22:00
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, 22:00
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