Question

In 3 saci se afla grau astfel: I+II=30KG

                                           II+III=37KG

                                            I+III=23KG

Cate kg sunt in fiecare sac?

Answer 1

I + II         = 30
     II + III  = 37
I +       III  = 23    adunate , obtinem ...
2*(I + II + III) = 90
  I + II + III =45     ⇒   30 + III = 45  ⇒  III = 15 kg.
                                     I + 37 = 45  ⇒    I =   8 kg.
                                    II + 23 = 45  ⇒   II = 22 kg.