Răspuns :
b=4a
c=b+a
a-
b- - - -
c - - - - -
suma 1000
1000:10=100a
100×4=400b
100×5=500c
c=b+a
a-
b- - - -
c - - - - -
suma 1000
1000:10=100a
100×4=400b
100×5=500c
a+b+c=1000;
a=b/4=>b=4a;
c=a+b=5a;
a+4a+5a=1000;
10a=1000;
a=100;
b=400;
c=500