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24 Aug 2017, 01:58
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B
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Difficulty:
5%
(low)
Question Stats:
92% (01:05) correct
8%
(01:58)
wrong
based on 69
sessions
History
Date
Time
Result
Not Attempted Yet
In the figure above, if angle BAC = 80°, then z =
(A) 100
(B) 105
(C) 110
(D) 120
(E) 125
Attachment:
2017-08-24_1249_003.png [ 9.98 KiB | Viewed 2826 times ]
Luckisnoexcuse
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Joined: 18 Aug 2016
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Concentration: Strategy, Technology
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GMAT 1: 630 Q47 V29
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24 Aug 2017, 02:47
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Bunuel
angle BAC = 80; hence x = 40
angle BCA = 30
hence angle ABC = 180-80-30 = 70
hence y= 35
z = 180 - 35 - 40 = 105
B
24 Aug 2017, 04:11
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2x=80, x=40
now in triangle ABC, total angle 80+2y+30=180; y=35
so in smaller triangle , x+y+z=180;40+35+z=180;z=105
now in triangle ABC, total angle 80+2y+30=180; y=35
so in smaller triangle , x+y+z=180;40+35+z=180;z=105
