Răspuns:
Explicație pas cu pas:
S = suprafata totala semanata
prima zi S/5
rest S - S/5 = 4S/5
a doua zi 3/8*4S/5 = 3S/10
rest 4S/5 - 3S/10 = 8S/10 - 3S/10 = 5S/10
a treia zi 5/8*5S/10 = 5S/16
5S/16 = 3S/10 + 3
5S/16 - 3S/10 = 3
25S/80 - 24S/80 = 3
S/80 = 3
S = 3*80 = 240 ha
Prima zi = 240/5 = 48 ha
A doua zi = 3*240/10 = 72 ha
A treia zi = 5*240/16 = 75 ha (sau 72 + 3 = 75)
A patra zi 240 - 48 - 72 - 75 = 45 ha
