Răspuns:
a)A=arie L=lungime l=latime P=perimetru
/=fractie,impartire
A=Lxl
l=A/L=10000/250=40 m
P=2(L+l)=2(250+40)=2x290=580 m
b) 10000x25%=2500 m² se cultiva grau
10000-2500=7500 m² se cultiva porumb
daca la 100 m²..............300 kg grau
la 2500 m²......................7500 kg grau (2500x300:100)
daca la 100 m²......................500 kg porumb
la 7500 m²..............................37500 kg porumb (7500x500:100)
c) (7500 kg grau x0.6)+(37500 kg porumb x 0.8)=4500+30000=34500 lei
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