Răspunsuri

2014-03-11T16:37:42+02:00
M= mama
f=fiica
m=f+20
in urma cu 4 ani.....m-4=3*(f-4)
f+20-4=3f-12
f+16=3f-12
16+12=3f-f
28=2f
f=14
m=14+20
m=34