aflam cati caini se folosesc la cele 2 sanii de marfa:
(20:4)x2=5x2=10 caini
aflam restul:
20-10=10 caini
aflam cati caini se folosesc la sania pentru concurs:
10:2=5 caini
aflam cati caini au fost inhamati ,in prima zi ,la toate saniile:
20+5=15 caini
aflam cati caini au participal a doua zi la proba de concurs?
20-15=5 caini