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Official Guide Quant Review - DS Q113 [#permalink]

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26 Oct 2006, 03:27

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hi guys, am having difficulty understanding this one.

Q: 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

Answer:
OG says that from this, x/y can be x/2 or x/6, but there is no way to know whether y=2 or y=6.

I tried understanding the concept of LCD from a few websites after google search, and my understanding is that the common denominators of 1/3 would actually be 3,6,9,12....3n,etc. How did OG come to fathon that 2 is a common denominator?