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16 May 2022, 01:30
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
74% (01:32) correct
26%
(01:20)
wrong
based on 34
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of \(xy – yz =\) ?
(1) \(yz – zx = 3\)
(2) \(zx – xy = 4\)
(1) \(yz – zx = 3\)
(2) \(zx – xy = 4\)
16 May 2022, 02:54
Kudos
Bookmarks
(1) Only
It is hard to believe that "yz–zx=3 " is sufficient to determine the value of xy-yz
Just to be safe, Try
x=1, y=2, z=3 => xy-yz=-4
x=2, y=3, z=3 => xy-yz=-3
Not sufficient
(2) Only
Very similar with (1)Only
Not sufficient
(1)(2) Together
Add (1)+(2)
=> yz-xy=7
Sufficient. (The answer is -7).
The answer is thus (C).
It is hard to believe that "yz–zx=3 " is sufficient to determine the value of xy-yz
Just to be safe, Try
x=1, y=2, z=3 => xy-yz=-4
x=2, y=3, z=3 => xy-yz=-3
Not sufficient
(2) Only
Very similar with (1)Only
Not sufficient
(1)(2) Together
Add (1)+(2)
=> yz-xy=7
Sufficient. (The answer is -7).
The answer is thus (C).
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