Răspuns :
x=virsta mamei
x+(8+1)+x+8=61
x+9+x+8=61
2x+17=61
2x=61-17
2x=44
x=44:2=22 ani are mama
22+9=31 ani are tatal
x+(8+1)+x+8=61
x+9+x+8=61
2x+17=61
2x=61-17
2x=44
x=44:2=22 ani are mama
22+9=31 ani are tatal