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05 Apr 2019, 01:56
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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:
35%
(medium)
Question Stats:
72% (01:47) correct
28%
(02:22)
wrong
based on 97
sessions
History
Date
Time
Result
Not Attempted Yet
In the figure, ABC is a right triangle. What is the value of y ?
(A) 20
(B) 30
(C) 50
(D) 70
(E) 90
Attachment:
2019-04-05_1255.png [ 37.78 KiB | Viewed 6351 times ]
05 Apr 2019, 03:21
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Bunuel
In Triangle ABC, x+y+20 = 180 i.e. x+y = 160
Angle ABD = 180 - (20+y) = 160-y = x (we already know that 160-y=x)
i.e. x < y ( as can be seen at point B)
i.e. y = 90 and x = 70 because we know that ABC is right triangle and the largest angle must be 90º
Answer: Option E
05 Apr 2019, 03:46
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GMATinsight
If angle ABC is given as right triangle, isn't it means angle B = 90 degree and therefore angle y = 90 degree as angle B is marked as Y degree.
Isn't it understood that B is the right angle.
