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B
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Difficulty:
55%
(hard)
Question Stats:
48% (01:41) correct
52%
(01:51)
wrong
based on 98
sessions
History
Date
Time
Result
Not Attempted Yet
In the figure above, if DE is parallel to ВС, what is the sum of the degree of angle ADE and angle ACB?
(1) AB = BC.
(2) Angle A is 70 degree.
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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
14 Feb 2011, 17:08
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As DE is parallel to ВС then <D=<B and <E=<C. Question: <D+<C=?
(1) AB = BC --> <A=<C --> <A+<C+<B=180 (sum of the interior angles of a triangle is 180 degrees) --> 2*<C+<B=180 --> as <D=<B then 2*<C+<D=180 --> <D+<C=180-<C. Not sufficient.
(2) Angle A is 70 degree. <A+<C+<B=180 --> 70+<C+<D=180 --> <D+<C=110. Sufficient.
Answer: B.
14 Feb 2011, 18:37
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Hi Bunuel, I am sure I may be missing something, but why not answer is B, we need to find <D + <C or <D+<E since <C = <E, since <A is 70, <D+<E = 110 or <D+<C = 110
?
?
