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30 Oct 2019, 01:19
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (00:37) correct
18%
(00:44)
wrong
based on 34
sessions
History
Date
Time
Result
Not Attempted Yet
Is triangle ABC above a right triangle?
(1) x – y = 0
(2) x + y = 90
Attachment:
image003.jpg [ 2.58 KiB | Viewed 1352 times ]
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
firas92
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Joined: 16 Jan 2019
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GMAT 1: 740 Q50 V40
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30 Oct 2019, 01:25
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Bunuel
(1) x – y = 0
x=y
ABC could be 60-60-60 equilateral triangle in which case it is not a right triangle
Or ABC could be 45-45-90 triangle in which case it is a right triangle
1 is not sufficient
(2) x + y = 90
\(\angle BAC\) = 180-(x+y) = 180-90 = 90
So ABC is a right triangle
2 is sufficient
Answer is (B)
30 Oct 2019, 07:31
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Bunuel
#1
x=y
2x+a=180
multiple possibilities
insufficient
#2
x+y+a=1890
a=90
sufficeint
IMO B
