a+b+c+d+e=30ha, a/2=3/b=c/4=d/5=e/6 folosim o proprietate a marimilor direct proportionale pentru a afla factorul de proportionalitate
(a+b+c+d+e)/2+3+4+5+6=30/20=3/2, a=2*(3/2)=3ha, b=3*(3/2)=9/2=4.5 ha,
c=4*(3/2)=6 ha, d=5*(3/2)=7.5 ha si e=6*(3/2)=9 ha