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2014-05-10T17:33:03+03:00
A----------------B----------------C
AB=12
BC/AB=2/3=k
BC=2k
AB=3k=12⇒k=12/3⇒k=4
BC=2*4
BC=8
AC=12+8
AC=20
AB/AC=12/20
AB/AC=3/5