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Problem Num : 1 Type: Understanding Section:Angle  Theme:None Adjustment# : 1 Difficulty: 500 level
Category	Pararell Lines and Angle
Analysis	x+2y=180
Solution/Answer	x=40 and 2y=140. so.. y-x=30 Answer: A

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Problem Num : 2 Type: Need an Idea Section:Angle  Theme:None Adjustment# : 10 Difficulty: 800 level
Category	Pararell Lines and Angle
Analysis	Use that sum of four interior angles of quadrilateral is 360.
Solution/Answer	W and Z are not related to x and y so that u can make a mistake easily. use that sum of four interior angles of quadrilateral is 360. (180-x)+(180-y)+(180-z)+(180-w)=360 x+y+z+w=360 Therefore, we can get the value x+y from both conditions. Discussion: what if asking x-y? Answer: C

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Array ( [0] => 4675 [1] => 4975 ) 2