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PostPosted: Wed Aug 01, 2007 4:12 pm    Post subject: advanced question Reply with quote
11th edition OG quantitative page 157 question # 113

If the fraction x/y, where x and y are positive integers, whats the value of y?

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

2. x=1

correct answer is E, but how do i get the lcd of x/y and 1/3 as 6?
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roopachet
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PostPosted: Wed Aug 01, 2007 6:30 pm    Post subject: LCM Reply with quote
LCM

Last edited by roopachet on Sat Aug 04, 2007 4:23 pm; edited 3 times in total
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paradox
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PostPosted: Wed Aug 01, 2007 9:55 pm    Post subject: Re: LCM Reply with quote
roopachet wrote:
if i am not wrong LCM of two numbers for example 2 and 3 is nothing but 2 multiplied by 3 that is 6. similarly x/y multiplied by 1/3 = 6 so x=18 y you still do not get the answer and hence E the answer.
Cheers
Roopachet


I'm not sure that this explanation is correct. Here is my explanation (but I'm no expert Very Happy ):

The LCD is 6, which means 6 is a multiple of y AND 3. Y could either be 2 or 6. Since there are two possible values for y, statement I is not sufficient to uniquely determine y.
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gabriel
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PostPosted: Wed Aug 01, 2007 11:15 pm    Post subject: Re: LCM Reply with quote
roopachet wrote:
if i am not wrong LCM of two numbers for example 2 and 3 is nothing but 2 multiplied by 3 that is 6. similarly x/y multiplied by 1/3 = 6 so x=18 y you still do not get the answer and hence E the answer.
Cheers
Roopachet


2 roopachet that soltion is wrong on many levels .. ur concept of LCM itself is wrong .. read this http://mathforum.org/library/drmath/sets/select/dm_lcm_gcf.html ..

btw i agree with paradox's answer ..
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