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Daca numerele x si y sunt direct proportionale cu 2 si 5, aflati cat la suta reprezinta x din y. Dau coroana! AM nevoie in 5 minute!

Răspuns :

x/2=y/5=k
x/2=k
y/5=k
x/2=y/5<=>5x=2y=>x=2y/5
y...................100%
2y/5.....................x%
x=2y*100/100/5/y=0,4=>x=40%y