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Source: — Data Sufficiency |
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by rijul007 » Mon Nov 07, 2011 1:03 am
1) x/y = 1

x = y

Doesnt tell us anything about the value of x

Insufficient

2) xy = 1


x = 1/y

Again doesnt tell us anything about the value of x


Insufficient

Combining both the statements

x/y = xy = 1

1/y = y
y^2 = 1
y = 1 [ y greater than 0]

x/y = 1
x = 1

Option C
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by neelgandham » Mon Nov 07, 2011 1:03 am
If x and y are greater than 0, is x = 1?

1) x/y = 1; (x,y) can take infinite number of values such as (1,1),(2,2),(3,3),(4,4).. Insufficient
2) xy = 1; (x,y) can take infinite number of values such as (1,1), (2,0.5), (3, 0.33).. Insufficient

From 1 and 2 we get x = y = 1 Sufficient Ans C
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by gmatblood » Mon Nov 07, 2011 1:05 am
IMO: E

from 1, x=y
from 2, xy = 1

from 1 and 2) x and y can be either -1 or 1.
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by rijul007 » Mon Nov 07, 2011 1:14 am
gmatblood wrote:IMO: E

from 1, x=y
from 2, xy = 1

from 1 and 2) x and y can be either -1 or 1.

Its already given in the ques, x and y are greater than 0.
If x and y are greater than 0, is x = 1?
1) x/y = 1
2) xy = 1
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by gmatblood » Mon Nov 07, 2011 1:19 am
rijul007 wrote:
gmatblood wrote:IMO: E

from 1, x=y
from 2, xy = 1

from 1 and 2) x and y can be either -1 or 1.

Its already given in the ques, x and y are greater than 0.
If x and y are greater than 0, is x = 1?
1) x/y = 1
2) xy = 1
my bad :( :(
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