If the successive tick marks shown on the number line above are equall

Question

https://gmatclub.com/forum/download/file.php?id=37545 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 x? (1) y = 1.5 (2) y – x = 1.2 image005.gif

koushik88 · Answer

From question we can say D/8=|y-x|

Statement 1 : D/8= |1.5-X| .... Not sufficient
Statement 2 : D/8= 1.2....we can derive D......Hence X can be determined and statement 2 is sufficient........Answer is B

akshay93 · Answer

I got this wrong earlier and i may be wrong again lol

I see 8 "open boxes" equally spaced, but i also got to keep in mind this is a number line. Can be negative to zero to positive.

(1) Insufficient because we don't know x and the distance between each tick.

(2) 4/8 of the total boxes = distance between y and x ; 1/2 B = 1.2 ; B = 2.4 (total) ; 2.4/8 = 0.3

B

reachskishore · Answer

Hi Bunuel,

I have a doubt in this question, are we to assume that the starting of these intervals, i.e., the one behind x, is "0". 
If it is "0", then stmt B would be sufficient. Or else, we need both the statements to solve this.
Please excuse me if my understand is not enough/wrong here. But, please do throw some light on this doubt of mine.

Regards,
Kishore

rajudantuluri · Answer

Shouldn't the answer be D? It says the ticks are equally spaced. So if Y, the fifth tick, is 1.5 then X, the first tick, should be 0.3. Statement 1 is sufficient.
The distance between Y and X, 4 tickets, is 1.2 so X=0.3 and Y=1.5
Statement 2 is also sufficient.

Am I missing something here?

rajudantuluri · Answer

Looking back at this I made the classic mistake of taking in statement 1 when viewing statement 2. The distance between Y and X is 1.2 that could be a range of values that satisfy this equation. X should be 1.3 and Y could be 2.5 and still Y-X=1.2

So Statement 2 is not sufficient. I hope statement 1 alone is sufficient now unless I have an enlightenment again later today :D

hellosanthosh2k2 · Answer

equally spaced number to the left of X is '0', i.e is the catch. Answer D

chetan2u · Answer

Hi  Bunuel ,
There may be a typo in the OA.
Since we do not what this number line represents, we may be looking at OA as C..
1) y=1.5..
We do not know the left corner is 0, if it is then x is 1.5/5*1=0.3..
It could be that each gap is 0.1, so x becomes 1.5-0.1*4=1.1
Insufficient
2) y-x=1.2
But we do not know what is y so insuff.

Combined..
Y-x=1.2
1.5-x=1.2
x=1.5-1.2=0.3
C

If the successive tick marks shown on the number line above are equall

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