DS - ratio/propotion : confused.

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DS - ratio/propotion : confused.

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
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Ratio.doc
DS- RATIO-Propotion
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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