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01 Jun 2016, 18:12
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
77% (01:46) correct
23%
(01:35)
wrong
based on 132
sessions
History
Date
Time
Result
Not Attempted Yet
There is a triangle ACE shown as above figure. what is the measurement of ∠BDF?
1) ∠A=80
2) ∠C=40
*An answer will be posted in 2 days.
1) ∠A=80
2) ∠C=40
*An answer will be posted in 2 days.
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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
02 Jun 2016, 16:56
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DBA = 125
DFA = 120
A + BDF + 125 + 120 = 360
A + BDF = 115
St1: A = 80 --> BDF = 35. Sufficient
St2: C = 40 --> Only the angles of triangle BCD can be found out. Not Sufficient
Answer: A
DFA = 120
A + BDF + 125 + 120 = 360
A + BDF = 115
St1: A = 80 --> BDF = 35. Sufficient
St2: C = 40 --> Only the angles of triangle BCD can be found out. Not Sufficient
Answer: A
05 Jun 2016, 18:55
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If we modify the original condition and the question, we can know the angle BDF if we know the angle A. That is because ABD has 125 degrees and AFD has 120 degrees. There is only one variable. Hence, there is high chance that D is the correct answer. In the case of the condition 1), if A=80degrees, BDF becomes 35 degrees. Hence, the condition 1) is sufficient. In the case of the condition 2), we cannot know the angle of BDF, it is not sufficient. Thus, the correct answer is A.
- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
