Posted by Lucre on Friday, August 8, 2008 at 6:10pm.
s = sister's age now
3s = Rodney's age now
s-1 = sister's age a year ago
3s-1 = Rodney's age a year ago
so
3s-1 = 4 (s-1)
3s - 1 = 4s - 4
I think you can take it from there.
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