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31 Jan 2016, 08:23
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
71% (00:58) correct
29%
(01:05)
wrong
based on 76
sessions
History
Date
Time
Result
Not Attempted Yet
31 Jan 2016, 11:24
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(1) 4x - 2y = 80
Since we have one equation and 2 variables we can't determine the values of variables.
Therefore , we can't comment whether x = y .
Not sufficient.
(2) x = (40 + y)/2
=> 2x = 40 + y
=> 2x - y = 40
Since we have one equation and 2 variables we can't determine the values of variables.
Not sufficient.
Combining 1 and 2 , we get
Though it might seem that since we have 2 equations , we should be able to determine the values .
However , both the equations are the same .
Not sufficient
Answer E
Since we have one equation and 2 variables we can't determine the values of variables.
Therefore , we can't comment whether x = y .
Not sufficient.
(2) x = (40 + y)/2
=> 2x = 40 + y
=> 2x - y = 40
Since we have one equation and 2 variables we can't determine the values of variables.
Not sufficient.
Combining 1 and 2 , we get
Though it might seem that since we have 2 equations , we should be able to determine the values .
However , both the equations are the same .
Not sufficient
Answer E
03 Feb 2016, 19:04
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Interesting question. My attempt:
If x=y (y = x) were true, we are looking at an upward sloping line passing through origin (0,0). The slope is 1 and y-intercept is 0. Keeping this in mind, let's look at the statements:
1. 4x - 2y = 80
Reducing it to 2x - y = 40
Rearranging it to y = 2x - 40
Slope of such a line is 2, y-intercept is -40 (0, -40) and it does not pass through the origin. x will never be equal to y on any point on this line. Sufficient.
2. 2x - y = 40 -> y = 2x - 40
Same equation as above. Same answer. Sufficient.
Answer (D).
If x=y (y = x) were true, we are looking at an upward sloping line passing through origin (0,0). The slope is 1 and y-intercept is 0. Keeping this in mind, let's look at the statements:
1. 4x - 2y = 80
Reducing it to 2x - y = 40
Rearranging it to y = 2x - 40
Slope of such a line is 2, y-intercept is -40 (0, -40) and it does not pass through the origin. x will never be equal to y on any point on this line. Sufficient.
2. 2x - y = 40 -> y = 2x - 40
Same equation as above. Same answer. Sufficient.
Answer (D).
