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x+y=?

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by Max@Math Revolution » Tue Jun 07, 2016 6:04 pm
x+y=?

1) Line A//line C
2) Line B//line D

*An answer will be posted in 2 days.
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Source: — Data Sufficiency |
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by Max@Math Revolution » Thu Jun 09, 2016 7:45 pm
We can modify the original condition and the question. If line A and line D are parallel, x+y=180. However, since conditions do not state that line A and line D are parallel to each other, the correct answer is E.

- 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.
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