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Numerele a,b,c sunt direct proportionalecu 8,12 si15.Aflati x si y astfel incit [tex] \frac{a}{16} [/tex] = [tex] \frac{b}{x} [/tex] = [tex] \frac{c}{y} [/tex]

Răspuns :

 a/16=b/x=c/ya=8k
b=12k
c=15k
8k/16=12k/x=15k/y
x=16*12k/8k=24
y=16*15k/8k=30