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Data suffciency

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Source: — Data Sufficiency |
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by aneesh.kg » Wed May 30, 2012 7:50 am
shrutib wrote:in the fraction x/y, x and y are positive integers, what is the value of y?

1. The least common denominator of x/y and 1/3 is 6.

2. x=1
Statement:
The LCM of y and 3 is 6, which means that
y = 2 or 6.
INSUFFICIENT

Statement(2):
No information on y.
INSUFFICIENT

Let's combine the two statements.
x = 1 and y = 2 or 6, means that
fraction x/y = 1/2 or 1/6

The Least Common Denominator of both 1/2 and 1/6 with 1/3 is 6.
y = 2 or 6.
INSUFFICIENT

[spoiler](E)[/spoiler] is correct.
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by GMAT Kolaveri » Wed May 30, 2012 8:38 am
shrutib wrote:in the fraction x/y, x and y are positive integers, what is the value of y?

1. The least common denominator of x/y and 1/3 is 6.

2. x=1
Look at both the statements before solving the problem!

Start with S2, X=1, no info regarding Y. So rule out BD.
Next S1, LCM of y and 3 is 6. y could be 2 or 2*3 ie 2 or 6. Rule out A
Taking together,still y has 2 values. Hence E
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