Counting a pack of wolves - Lycée Bellevue (Alès) Colegiul National Emil Racovita (Cluj - Roumanie), Lycée Val de Durance (Pertuis), Colegiul National Mihail Eminescu (Satu Mare - Roumanie)

We imagine that in a packet of rice some grains are green. Develop a model or a process to count these grains of rice (without counting them one by one).
Compare your approach to scientists whose work is to count animal species.