a= terenul
5a/14 = 1 zi
a-5a/14=(14a-5a)/14=9a/14 restul dupa 1 zi
9a/14 x 5/12 = 15a/56 a 2-a zi
9a/14-15a/56= (36a-15a)/56= 21a/56 restul dupa a 2-a zi
21a/56 x 3/7=9a/56 a 3-a zi
a-5a/14- 15a/56-9a/56=60
56a-20a-15a-9a=3360
12a=3360
a=280 ha
1 zi = 280x5/14= 100 ha
a 2-azi = (280-100)x5/12= 75 ha
a 3-a zi = (180-75)x3/7= 45 ha
a 4-a zi = 60 ha