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any idea how to solve the following two questions?

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by n_niaz » Sat Aug 29, 2009 5:41 am
Any idea how to solve this?
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Source: — Data Sufficiency |
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by pradeepsarathy » Sat Aug 29, 2009 6:54 am
IMO E as well...


Stmt 1 -

2x-2y = 1

=> x - y = 1/2

Let x = 1, y = 1/2 => x-y=1/2, both x and y are positive.

Let x = -1/2 , y= -1 => x-y =1/2 both x and y are negative.

Insufficient

Stmts 2 -

x/y>1
=> x > y

x = 2 , y = 1 both are positive.
x = 2, y = -1, x is positive and y is negative

Insufficient

Stmt 1 and Stmt 2 -

Same example as in stmt 1

Insufficient
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by PussInBoots » Sat Aug 29, 2009 10:08 pm
(C)

x-y = .5
x = y + .5

x/y > 1
(y+.5)/y > 1
1 + .5/y > 1

Hence y > 0, then x > 0 also
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by n_niaz » Sat Aug 29, 2009 11:43 pm
thanks for this -- OA is C

PussInBoots wrote:(C)

x-y = .5
x = y + .5

x/y > 1
(y+.5)/y > 1
1 + .5/y > 1

Hence y > 0, then x > 0 also
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