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31 -#23

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Source: — Data Sufficiency |
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Re: 31 -#23

by bingojohn » Mon Aug 20, 2007 6:59 am
magical cook wrote:Hi,

Can anone help?

Thanks,
Is it [E]?

Bottomline, x + y = 1 (x and y are both fractions)

Statement(1), if y > 0.15, then x < 0.85 must be true, but that doesn't necessarily mean that x < 0.8 will be true. NS

Statement(2), NS

Together, NS.

What is OA?
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by magical cook » Wed Aug 22, 2007 11:35 am
Yes, I thought E as well but OA is B.

hmmm.. can anyone give us help?
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by agps » Wed Aug 22, 2007 12:35 pm
if x+y=1
and c=6.5x+8.5y

and c>=7.3 (Stantement 2)

substitute c for 7.3

7.3=6.5x+8.5y
x=1-y

7.3 =6.5-6.5y+8.5y
2y=7.3-6.5
2y=0.8
y=0.4
so x=0.6

if c>7.3, y increases lowering x, try c=8
(...)
2y=8-6.5
2y=1.5
y=0.75
x=0.25

so x is always less than 0.8
B is the answer
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