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23 Jan 2025, 23:43
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werty_123
Can we also think on this lines?
In GMAT options are always in ascending or descending order. So the right answer would either be A or E in this case
It is not known whether x, y and z are positive or negative, but it doesn't matter. We know that x is larger than z, so x-z will be positive and z-x will be negative. We don't need to know the values or the signs.
To double check, pick some values (keeping in mind that x > y > z):
x=10, y=4, z=1
Now the answer choices become:
(A) x − z = 9
(B) x − y = 6
(C) y − x = -6
(D) z − y = -3
(E) z − x = -9
Option (A) is the greatest. A for Ali, obviously. :wink:
If you want to be super double extra sure, because you're not convinced that the sign of the numbers doesn't matter, then pick some wild numbers and see if it makes a difference.
x=10, y=0, z=-a bazillion
Now the answer choices become:
(A) x − z = a bazillion + 10
(B) x − y = 10
(C) y − x = -10
(D) z − y = -a bazillion
(E) z − x = -a bazillion - 10
Still (A)
In GMAT options are always in ascending or descending order. So the right answer would either be A or E in this case
davedekoos
gmatlbs
(A) x − z
(E) z − x
Absolute value of both the options are same.
(But the sign of x , y and z is not mentioned....Is it really going to make any difference to this question !!! )
Option A.
(E) z − x
Absolute value of both the options are same.
(But the sign of x , y and z is not mentioned....Is it really going to make any difference to this question !!! )
Option A.
It is not known whether x, y and z are positive or negative, but it doesn't matter. We know that x is larger than z, so x-z will be positive and z-x will be negative. We don't need to know the values or the signs.
To double check, pick some values (keeping in mind that x > y > z):
x=10, y=4, z=1
Now the answer choices become:
(A) x − z = 9
(B) x − y = 6
(C) y − x = -6
(D) z − y = -3
(E) z − x = -9
Option (A) is the greatest. A for Ali, obviously. :wink:
If you want to be super double extra sure, because you're not convinced that the sign of the numbers doesn't matter, then pick some wild numbers and see if it makes a difference.
x=10, y=0, z=-a bazillion
Now the answer choices become:
(A) x − z = a bazillion + 10
(B) x − y = 10
(C) y − x = -10
(D) z − y = -a bazillion
(E) z − x = -a bazillion - 10
Still (A)
That rule obviously does not apply to questions where we need to calculate the largest or smallest values.
24 Jan 2025, 01:26
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Even if you take z = -5, y = -4, and x = -3 or z = 3, y = 4, and x = 5
For both cases, option A will give you 2, and option E will give you -2. We have only one answer option A.
For both cases, option A will give you 2, and option E will give you -2. We have only one answer option A.
werty_123
Can we also think on this lines?
In GMAT options are always in ascending or descending order. So the right answer would either be A or E in this case
It is not known whether x, y and z are positive or negative, but it doesn't matter. We know that x is larger than z, so x-z will be positive and z-x will be negative. We don't need to know the values or the signs.
To double check, pick some values (keeping in mind that x > y > z):
x=10, y=4, z=1
Now the answer choices become:
(A) x − z = 9
(B) x − y = 6
(C) y − x = -6
(D) z − y = -3
(E) z − x = -9
Option (A) is the greatest. A for Ali, obviously. :wink:
If you want to be super double extra sure, because you're not convinced that the sign of the numbers doesn't matter, then pick some wild numbers and see if it makes a difference.
x=10, y=0, z=-a bazillion
Now the answer choices become:
(A) x − z = a bazillion + 10
(B) x − y = 10
(C) y − x = -10
(D) z − y = -a bazillion
(E) z − x = -a bazillion - 10
Still (A)
In GMAT options are always in ascending or descending order. So the right answer would either be A or E in this case
davedekoos
gmatlbs
(A) x − z
(E) z − x
Absolute value of both the options are same.
(But the sign of x , y and z is not mentioned....Is it really going to make any difference to this question !!! )
Option A.
(E) z − x
Absolute value of both the options are same.
(But the sign of x , y and z is not mentioned....Is it really going to make any difference to this question !!! )
Option A.
It is not known whether x, y and z are positive or negative, but it doesn't matter. We know that x is larger than z, so x-z will be positive and z-x will be negative. We don't need to know the values or the signs.
To double check, pick some values (keeping in mind that x > y > z):
x=10, y=4, z=1
Now the answer choices become:
(A) x − z = 9
(B) x − y = 6
(C) y − x = -6
(D) z − y = -3
(E) z − x = -9
Option (A) is the greatest. A for Ali, obviously. :wink:
If you want to be super double extra sure, because you're not convinced that the sign of the numbers doesn't matter, then pick some wild numbers and see if it makes a difference.
x=10, y=0, z=-a bazillion
Now the answer choices become:
(A) x − z = a bazillion + 10
(B) x − y = 10
(C) y − x = -10
(D) z − y = -a bazillion
(E) z − x = -a bazillion - 10
Still (A)
05 Feb 2025, 00:14
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Bookmarks
Clearly,
x>y>z
Lets substitute values;
x = 3
y = 2
z = 1
Lets check the options:
A.) x-z = 3-1 => 2
B.) x-y = 3-2 => 1
C.) y-x = 2-3 => -1
D.) z-y = 1-2 => -1
E.) z-x = 1-3 => -2
So, A is the answer
x>y>z
Lets substitute values;
x = 3
y = 2
z = 1
Lets check the options:
A.) x-z = 3-1 => 2
B.) x-y = 3-2 => 1
C.) y-x = 2-3 => -1
D.) z-y = 1-2 => -1
E.) z-x = 1-3 => -2
So, A is the answer
