All I tried to post a pic , but failed to figure it out. So adding an attachment.
Thanks,
T
DS - ratio/propotion : confused.
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- jayhawk2001
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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
2 - sufficient. my + xy = xr + xy.
So, m/r = x/y
Hence B