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oc/oa=bd/ab
oc/5=8/6
6oc=40
oc=40/6
nastepnie
oc/oa=od/ob
40/6/5=od/11
5od=40/6*11
5od=440/6 *1/5
od=88/6
i na koniec
oc/ac=od/bd
40/6/ac=88/6/8
88/6ac=320/6 *6
88ac=320
ac=320/88=40/11
odp A