Răspuns :
a+b+c=300
{a,b,c} d.p {3,5,7}
a/3=k a=3k
b/5=k b=5k
c/7=k c=7k
3k+5k+7k=300
15k=300
k=20
a=60
b=100
c=140
verificare
60+140+100=300
a+b+c=300
{a,b,c} d.p {3,5,7}
a/3=k a=3k
b/5=k b=5k
c/7=k c=7k
3k+5k+7k=300
15k=300
k=20
a=60
b=100
c=140
60+140+100=300