Notam:
s - greutatea oului de strut ;
g - greutatea oului de gaina.
[tex] \it 20g = s\ \ \ (1)
[/tex]
[tex]\it3s+60g = 9|_{:3} \Longrightarrow s+20g=3 \ \ \ \ (2)[/tex]
[tex]\it(1),\ (2) \Longrightarrow s+s =3 \Longrightarrow 2s = 3 \Longrightarrow s =\dfrac{3}{2} \Longrightarrow s =1,5\ kg[/tex]
