Răspuns:
a/2=b/6=c/8=k
a=2k
b=6k
c=8k
2a+3b+c=90
2·2k+3·6k+8k=90
4k+18k+8k=90
30k=90=>k=90:30=>k=3
a=2·3=6
b=3·6=18
c=8·3=24