You can put this solution on YOUR website! what is rs=15 and rt=18,then st= what
------------
Not enough info for a unique solution.
eg,
r = 1 --> s=15 & t=18 so st = 270
r = 3 --> s = 5 & t = 6 so st = 30
r = 5 --> s = 3 & t = 3.6 so st = 10.8
etc
==============
In literal terms:
s = 15/r
t = 18/r
-->
