Răspuns :
In urma cu 2 ani In prezent
--------------------------------------------------------------------------------
SORIN y-2 y
IOANA x-2 x
---------------------------------------------------------------------------------
conform enunt y=3(x-2)=21
y=21 ani
3(x-2)=21⇒x-2=7⇒x=9 ani
S=21+9=30 ani
--------------------------------------------------------------------------------
SORIN y-2 y
IOANA x-2 x
---------------------------------------------------------------------------------
conform enunt y=3(x-2)=21
y=21 ani
3(x-2)=21⇒x-2=7⇒x=9 ani
S=21+9=30 ani