Stmt I
2x-2y = 1
x-y=1/2
x=1 y=1/2
x=-1/2 y = -1
INSUFF
Stmt II
x/y>1
Both x and y are positive or both are negative
Combining I and II
x and y are both positive
C)
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Prep Integers
Source: Beat The GMAT — Data Sufficiency |
can u guys help me out here...
what if X = - 0.1 and Y = -0.6
X is Still Greater than Y; and X - Y is still 0.5(1/2)
Now, both are not positive..
Should the answer not be E?
Not sure what exactly I am missing here..
what if X = - 0.1 and Y = -0.6
X is Still Greater than Y; and X - Y is still 0.5(1/2)
Now, both are not positive..
Should the answer not be E?
Not sure what exactly I am missing here..
Ok here is an issue I have with this problem
statement II says that x/y > 1
can we also write this statement as x>y?
because if we convert this statement to x>y, the solution changes from C to E.
Here how it goes..
x = - 3.5
y = -4
x>y or -3.5>-4 (statement holds true)
2x - 2y = 1
or
-7 +8 = 1
1=1
we could also have:
x = 4 and y = 3.5 when both x and y are positive
x>y ------YES
2(4) - 2(3.5) = 1
8-7 = 1
1=1
Hence, E
For C to hold true we basically are forbidden to cross multiply the equation x/y > 1. Instead we are solving this equation as x/y - 1 > 0
statement II says that x/y > 1
can we also write this statement as x>y?
because if we convert this statement to x>y, the solution changes from C to E.
Here how it goes..
x = - 3.5
y = -4
x>y or -3.5>-4 (statement holds true)
2x - 2y = 1
or
-7 +8 = 1
1=1
we could also have:
x = 4 and y = 3.5 when both x and y are positive
x>y ------YES
2(4) - 2(3.5) = 1
8-7 = 1
1=1
Hence, E
For C to hold true we basically are forbidden to cross multiply the equation x/y > 1. Instead we are solving this equation as x/y - 1 > 0
I dont think so since we dont know the sign of ystatement II says that x/y > 1
can we also write this statement as x>y?
If y was positive then yes x>y but if y was negative then x<y
one more thing...
we have x=y+1/2 from 1 stmt.
put it in 2nd stmt
(y+1/2)/y > 1
1+(1/2y) > 1 or 1/2y > 0
which is only possible if y>0
and if y>0, x is also greater than 0 from 2.
Hope it helps.
we have x=y+1/2 from 1 stmt.
put it in 2nd stmt
(y+1/2)/y > 1
1+(1/2y) > 1 or 1/2y > 0
which is only possible if y>0
and if y>0, x is also greater than 0 from 2.
Hope it helps.
What if i have not yet beat the beast, I know i will beat it!!!!!!!!
this is great!jimmiejaz wrote:one more thing...
we have x=y+1/2 from 1 stmt.
put it in 2nd stmt
(y+1/2)/y > 1
1+(1/2y) > 1 or 1/2y > 0
which is only possible if y>0
and if y>0, x is also greater than 0 from 2.
Hope it helps.
The answer has to be E
(1) x=0.5 y=0 or x=1 y=0.5
(2) simply says that x>y not Sufficient
(1) and (2) both not enough because in (1) for both options x>y
(1) x=0.5 y=0 or x=1 y=0.5
(2) simply says that x>y not Sufficient
(1) and (2) both not enough because in (1) for both options x>y
Maxx
Hey moneyman,moneyman wrote:The answer has to be E
(1) x=0.5 y=0 or x=1 y=0.5
(2) simply says that x>y not Sufficient
(1) and (2) both not enough because in (1) for both options x>y
We can't say x/y > 1 as x>y since we dont know that y is positive.
If y is negative, the eqn becomes x<y.
hope it helps.
So, the ans is C
What if i have not yet beat the beast, I know i will beat it!!!!!!!!
