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Official Guide Quant Review - DS Q113

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Intern
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Official Guide Quant Review - DS Q113 [#permalink] New post 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?

thanks for the help!

p.s: yipes!!! 5 days left!
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 [#permalink] New post 26 Oct 2006, 03:36
Is the answer E here?

I think for fractions the LCM is HCF of numerator/LCM of denominators

For eg LCM of 1/2 and 3/4 is LCM of 1 and 3 (which are numerators) ie., 3 and HCF of denominators ie., 2 so 3/2 is the LCM


||ly here we cannot find 'cos y may be 6 or 2
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 [#permalink] New post 26 Oct 2006, 05:13
Hi sorry i should have put that up on the thread.

The answer provided by the guide is E. I chose that too but by divine intervention that i got that right .. heh

thanks for the reply dude, but care to elaborate a little? I don't really get your explaination.

cheers
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 [#permalink] New post 26 Oct 2006, 05:25
LCM of x/2 and 1/3 would be 6: 2*3.....

Or it could be x/6 and 1/3......
  [#permalink] 26 Oct 2006, 05:25
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