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    The variables R&S are inversely proportional, so that means that our equation says R equal K / s So when R is 6, we can figure out our K which is a constant of proportionality. So our K is 24. If our K is 24, then we can put the Rs 10 and figure out what our new S is. We cross multiply 10 S equal 24 S equal 24 tenths and of course we're going to reduce that to 12 fifths.