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GMAT Prep : Ratio Sum

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GMAT Prep : Ratio Sum

by Skywalker » Tue Oct 05, 2010 9:02 pm
Hi,

Can someone let me know why the [spoiler]OA = E[/spoiler] and not C ? We have 2 variables & 2 equations here....thus can't we solve of X and Y ...get their values & find the difference pls



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Source: — Data Sufficiency |
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by neerajkumar1_1 » Tue Oct 05, 2010 10:07 pm
u should simplify the equations u get by solving the statements...
remember that knowing 2 distinct equations guarantees sufficiency..

statement1)

xy/(x+y) = 2/3x
after simplifying, we get
y=2x
insufficient

statement 2)
y= 2x
insufficient

together, the statements are the same, Hence insufficient
IMO: E
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by ashokkadam » Tue Oct 05, 2010 10:45 pm
agree with neerajkumar1_1
neerajkumar1_1 wrote:u should simplify the equations u get by solving the statements...
remember that knowing 2 distinct equations guarantees sufficiency..

statement1)

xy/(x+y) = 2/3x
after simplifying, we get
y=2x
insufficient

statement 2)
y= 2x
insufficient

together, the statements are the same, Hence insufficient
IMO: E
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