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Benchmark Values (MGMAT Fractions Strategy)

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Benchmark Values (MGMAT Fractions Strategy) [#permalink] New post 24 Dec 2009, 04:26
Hello Fellows,

could you please explain one specific thing whithin Benchmark Values (BV) area which are used to compare fractions?

General idea is that one can transform most fractions in one of the follwing Benchmark Values: \frac{1}{4}, \frac{1}{3}, \frac{1}{2}, \frac{2}{3} and \frac{3}{4}

Question:
There are many cases where in is not clear which BV to use and this may change the answer completely.
Do you know some specific rule for this?

For example, for \frac{5}{18} MGMAT states BV for it \frac{1}{4}. But on my opinion, I would also take \frac{1}{3}

Thank you in advance.

PS. If more clarification needed pls let me know.
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Re: Benchmark Values (MGMAT Fractions Strategy) [#permalink] New post 08 Feb 2010, 13:01
All I can think of is the following:

1/4 = 4.5 /18
1/3 = 6/18

|5- 4.5| < |5 - 6|

Hope that helps
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Re: Benchmark Values (MGMAT Fractions Strategy) [#permalink] New post 01 Jul 2010, 05:02
This makes sense - I had the same problem using MGMAT benchmark values as well (but the book didnt explain WHY they chose 1/4 instead of 1/3)
Re: Benchmark Values (MGMAT Fractions Strategy)   [#permalink] 01 Jul 2010, 05:02
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