Răspuns :

Mocanustefi13id
a/5=b/7=c/8
a/5=b/7 => a=5b/7
b/7=c/8 => c=8b/7
a+b+c=600

5b/7+b+8b/7=600 /*7
5b+7b+8b=4200
20b=4200/:20
b=210
a=5b/7 => a=1050/7 => a=150
c=8b/7=> c=1680/7 => c=240

Verificare: 150+210+240=600 (A)

Succes! :)

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