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24 Aug 2018, 05:16
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B
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Difficulty:
15%
(low)
Question Stats:
86% (00:52) correct
14%
(00:56)
wrong
based on 54
sessions
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Not Attempted Yet
If AB||CD, what is the sum of angle ABC and angle BCD?
(1) ABC is more than 80°.
(2) BCD is 90°.
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Chethan92
Joined: 18 Jul 2018
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Location: India
Concentration: Operations, General Management
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GMAT 1: 590 Q46 V25
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24 Aug 2018, 05:20
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1 is insufficient.
From 2: BCD = 90. Then ABC = 90.
BCD+ABC = 180.
B is sufficient
Posted from my mobile device
From 2: BCD = 90. Then ABC = 90.
BCD+ABC = 180.
B is sufficient
Posted from my mobile device
24 Aug 2018, 06:00
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Bunuel
Given, AB || CD,
To find sum of angle ABC and angle BCD, we require the measure of any of the two angles.
Note:-(If the two lines crossed are parallel, the alternate angles are equal. Angle ABC=Angle BCD)
St1:- ABC is more than 80°.
No fixed measure of angle ABC.
Insufficient.
St2:-BCD is 90°
So, \(\angle{BCD}=\angle{ABC}=90°\)Therefore, sum of angle ABC and angle BCD can be determined.
Sufficient.
Ans. (B)
