well, 16 = (20/5)^2
you're going to have to have a log5 in there somewhere.
If log 20=P, express log 16 in terms of P.
I actually don't want an answer. Is there possibly a hint I can get about an approach to the question? I thought it might have to do something with the common factors of 16 and 20, but I'm not sure.
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