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DS - ratio/propotion : confused.

GMATDUD: Senior | Next Rank: 100 Posts; Posts: 62; Joined: Tue Jan 16, 2007 9:40 am; Location: Arlington,VA

by GMATDUD » Tue Dec 11, 2007 12:48 pm

All I tried to post a pic , but failed to figure it out. So adding an attachment.

Thanks,
T

Attachments

Source: Beat The GMAT — Data Sufficiency | Tue Dec 11, 2007 12:48 pm

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pm; Location: Silicon valley, California; Thanked: 30 times; Followed by:1 members

by jayhawk2001 » Tue Dec 11, 2007 5:47 pm

1 - insufficient. m/y = x/r. We don't know if m/r = x/y

2 - sufficient. my + xy = xr + xy.
So, m/r = x/y

Hence B

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