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Verified answer
³log5 = p⁴log3 = q
¹²log15
= ³log15 / ³log12
= ³log(3 . 5) / ³log(3 . 4)
= [³log3 + ³log5] / [³log3 + ³log4]
= [1 + p] / [1 + (1/q)]