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question from the real kaplan test

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by sana.noor » Fri Jun 21, 2013 10:57 pm
Why statement 1 isnt sufficient, if the two lines arnt parallel, still a+ b < 180. the two angles cant be greater than 180
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Source: — Data Sufficiency |
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by melguy » Sat Jun 22, 2013 1:01 am
Lines m and n are not parallel . So the possibilities are

1)
Angle A = 89
Angle B = 90
Angle A + Angle B = 179

a+b < 180 (Yes)

2)
Angle A = 91
Angle B = 92
Angle A + Angle B = 183

a+b < 180 (No)

Remember figures are not drawn to scale.
Last edited by melguy on Sun Jun 23, 2013 11:05 pm, edited 1 time in total.
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by sana.noor » Sat Jun 22, 2013 1:30 am
what my concern is that angle a and b are formed at line l and total angle of line l is 180 degree. if angle a and b are formed at line L then how can they exceed 180 degree? Only the case could be that both the angles are obtuse angle but when i look at the figure then none of the two angles are obtuse. :(
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by melguy » Sat Jun 22, 2013 4:11 am
Remember figures are not drawn to scale. If an angle looks 90 degrees then it does not means its 90 degrees.

All we know for sure is that a+x = 180 degrees and y+b = 180 degrees.

Based on the info in the question we cannot conclude that a+b is either less or more than 180 degrees as per the reasoning provided in the previous post.

Hope that helps.
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by faraz_jeddah » Sun Jun 23, 2013 11:38 pm
sana.noor wrote:Why statement 1 isnt sufficient, if the two lines arnt parallel, still a+ b < 180. the two angles cant be greater than 180
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So what is the OA?
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by varun289 » Sun Jun 23, 2013 11:57 pm
OA must be E
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by sana.noor » Wed Jun 26, 2013 10:14 am
E it is
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