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Re: DS - number properties [#permalink]
12 Jul 2007, 18:15

asaf wrote:

In the fraction x/y, where 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

E?? 2 is obviously insufficient.
from 1), we know that y is a multiple of 6.
1/3 = 2/6 = 4/12 (not sure if this reasoning is sound) whose denominators are all multiples of 6.

1 and 2 lets us know that x/y = 1/6(N) and that 1/3 = 2/6, 4/12 etc.
still nothing

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