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Value of r

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Source: — Data Sufficiency |
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by raghavsarathy » Sun Jul 26, 2009 8:21 am
Simplify the left side of the eqn

We will end up with 5(y-1)

The right side of the eqn is r(y-1)

Hence from the main statement we get to know that r=5

The same info has been stated in Statements 1 and 2. No information abt value of y

Hence E
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by gmat740 » Sun Jul 26, 2009 9:15 am
raghavsarathy wrote:Simplify the left side of the eqn

We will end up with 5(y-1)

The right side of the eqn is r(y-1)

Hence from the main statement we get to know that r=5

The same info has been stated in Statements 1 and 2. No information abt value of y

Hence E
Statement 1 : r =+5 or -5
so when r =+5 => we cant calculate

But when r = -5=> 5(y-1) = -5(y-1)
5y-5 = -5y +5
10y = 10 = > y=1

SO A
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by gmat_2010 » Fri Jul 31, 2009 1:03 pm
But, statement 1 doesn't state that r is not equal to 5. Hence, E.
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