Va rog frumos ajutati-ma!Am nevoie urgent!

2(AB+2AB/3)=100
2*5AB/3=100
AB/3=10
AB=30 cm
BC=2AB/3=20 cm
as simpkle as thar!!
verificare
20/30=2/3 si 2(30+20)=100
adevarate ambele, deci bine rezolvat