Pai prima data completam tabelul:
137kg...........1644lei
23kg.........xlei
Iar de aici vine asa
x=[tex] \frac{23*1644}{137} = \frac{37812}{137} =276[/tex]
(apropo, spatiul liber il notam cu x si y)
y=[tex] \frac{331*276}{23} = \frac{91356}{23} =3972[/tex]
Daca 137 de kg de mere costa 1644lei, aflati cat costa 23 kg de mere. Dar 331kg de mere?
