L=l+70
perimetrul=460=2L+2l=2(l+70)+2l=2l+140+2l, 4l=460-140=320, l=320/4=80 m=8dam
L=80+70=150m=15dam
A=Lxl=15x8=120[tex] dam^{2} [/tex]=120 ari
A=Lxl-150x80=12000 [tex] m^{2} [/tex], 1ha=10000[tex] m^{2} [/tex]
folosim regula de trei simpla
10000.............15
12000..............x
x=(12000*15)/10000=18 tone=productia fermierului in acest an
