👤

IN 3 sticle se afla 129 l apa .Cati l de apa se afla in fiecare sticla daca in prima si a doua ,la un loc,se afla 80 l,iar in a doua si a treia se afla 91 l?

(Clasa a 2 )


Răspuns :

a+b=80

b+c=91

a+b+c=129

80+c=129

c=129-80

c= 49

b+49=91

b=91-49

b= 42

a=80-42

a=38