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Ana si Dan rezolva probleme de matematica
In ce timp Dan rezolva 3 probleme , Ana rezovla 6 probleme.
Cate probleme rezolva fiecare? daca impreuna au rezolvat 108 probleme.


Răspuns :

notam timpul cu ,,a"
(3probleme +6 probleme)x a=108
9a=108
a=108:9
a=12   minute presupun

verificare
Dan =3probleme/minx12=36 probleme
Ana=6probleme/minx12=72
72+36=108