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How many degrees is angle c?

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 51263
How many degrees is angle c?  [#permalink]

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New post 22 Jan 2016, 09:24
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

90% (00:17) correct 10% (00:16) wrong based on 33 sessions

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Intern
Intern
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Joined: 19 Jan 2016
Posts: 45
How many degrees is angle c?  [#permalink]

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New post 22 Jan 2016, 19:08
As the figure, (A+B+C) = 180, if we know (A+B), we know C

(1) B=90 => how about A? => no ideas about (A+B) => (1) alone not sufficient
(2) (A+B)=131 => clearly, C = 180 - 131 = a certain degree => (2) alone sufficient.

=> B is the answer choice.

Is this problem actually a 600-700 Q?

I think the only trick here is whether A, B and C are three adjacent supplementary angles or not (if not, A + B + C = un-specific degree and the problem can't be solve with both (1) and (2) and the answer choice must be E)
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How many degrees is angle c? &nbs [#permalink] 22 Jan 2016, 19:08
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How many degrees is angle c?

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