Răspuns :
a+b+c=100
b=4a=>a=b/4
b=c-19=>c=b+19
b/4+b+b+19=100
b+4b+4b+76=400
9b=400-76
b=324:9=36
a=36:4=9
c=36+19=55
b=4a=>a=b/4
b=c-19=>c=b+19
b/4+b+b+19=100
b+4b+4b+76=400
9b=400-76
b=324:9=36
a=36:4=9
c=36+19=55
a+b+c=100;
b=a x 4;
c=b+19;
a+a *4+a*4+19=100;
9a+19=100;
9a=81 ;
a=9;
b=9x4=36;c=36+19=55