ray CD

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kanha81: Master | Next Rank: 500 Posts; Posts: 431; Joined: Sat Jan 10, 2009 9:32 amFollowed by: 1 member; Thanked: 16 times

by kanha81 » Thu Jun 11, 2009 1:42 pm

In the attached figure, if ray CD rotated 35 counterclockwise, what will be the value of the ratio (m DCB) : (m ACD)?

A) 5/36
B) 7/36
C) 1/3
D) 1/2
E) 2/3

A relatively simple problem, what I couldn't understand was should I subtract or add the 35 from the angle of DCB?

Just realized posted in wrong FORUM. Sorry, Moderators, please move this thread to Problem Solving area!

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Source: Beat The GMAT — Data Sufficiency | Thu Jun 11, 2009 1:42 pm

ssmiles08: Master | Next Rank: 500 Posts; Posts: 472; Joined: Sun Mar 29, 2009 6:54 pm; Thanked: 56 times

by ssmiles08 » Thu Jun 11, 2009 1:49 pm

I think you add 35.

so it 60/120= 1/2

clockwise moves towards B; (think of ray CD as hand on the clock...so its moving from 12 to 1 to 2 to 3)

anti clockwise moves towards A

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