polygon

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mariah: Master | Next Rank: 500 Posts; Posts: 131; Joined: Tue Aug 05, 2008 3:28 pm; Thanked: 2 times

by mariah » Fri Jan 23, 2009 1:24 pm

10.There is a picture. The interior angles of a polygon are 2x, 2x, 3x, 2x, x, respectively. Y is the supplement angle of the 3x measure angle. Y=?

dont have oa ,

Last edited by mariah on Sun Feb 08, 2009 9:37 pm, edited 1 time in total.

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Source: Beat The GMAT — Problem Solving | Fri Jan 23, 2009 1:24 pm

truplayer256: Master | Next Rank: 500 Posts; Posts: 392; Joined: Thu Jan 15, 2009 12:52 pm; Location: New Jersey; Thanked: 76 times

by truplayer256 » Fri Jan 23, 2009 1:32 pm

2x+2x+2x+3x+x=540
x=54
3x+y=180
3(54)+y=180
y=180-162=18

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