Răspuns:
Explicație pas cu pas:
m = cantitatea initiala
prima zi 40m/100 = 2m/5
rest m - 2m/5 = 5m/5 - 2m/5 = 3m/5
a doua zi 60/100*3m/5 = 3/5*3m/5 = 9m/25
rest 3m/5 - 9m/25 = 15m/25 - 9m/25 = 6m/25
2m/5 = 6m/25 + 96
2m/5 - 6m/25 = 96
10m/25 - 6m/25 = 96
4m/25 = 96
m = 25*96/4 = 600 t