Răspuns :
a/5=b/6=c/10=k⇒a=5k, b=6k, c=10k. in locuim in egalitatea din enunt
25k+12k-30k=84
7k=84
k=12
a=60, b=72, c=120
25k+12k-30k=84
7k=84
k=12
a=60, b=72, c=120
a/5=b/6=c/10
Din a/5=b/6 => a=5b/6
Din b/6=c/10 => c=10b/6
5*5b/6+2b-3*10b/6=84 =>25b/6+2b-5b=84 =>25b/6-3b=84 /*6 => 25b-18b=504 => 7b=504 =>b=504/7 => b=72
a=5*72/6
c=10*72/6
Din a/5=b/6 => a=5b/6
Din b/6=c/10 => c=10b/6
5*5b/6+2b-3*10b/6=84 =>25b/6+2b-5b=84 =>25b/6-3b=84 /*6 => 25b-18b=504 => 7b=504 =>b=504/7 => b=72
a=5*72/6
c=10*72/6