Răspuns :
7ani
I-------I
31ani
I-------------------------------I
7 x
I-------I-----------------I (7 +x ) ani
I-------------------------------I-----------------I (31+x) ani
2(7+x)= 31+x
14+2x=31+x
x= 31-14=17 ani
andrei =7+17=24
tatal 31+17=48
I-------I
31ani
I-------------------------------I
7 x
I-------I-----------------I (7 +x ) ani
I-------------------------------I-----------------I (31+x) ani
2(7+x)= 31+x
14+2x=31+x
x= 31-14=17 ani
andrei =7+17=24
tatal 31+17=48
Andrei : /-----------------------/
tatal:/--------------------------------------/
2x7+X=31+X
14+X=31+X
14+2X=31+X
X=31-14=17
ANDREI:17+7=24
TATAL:17+31=48