Răspuns :
Anca=a
Diana=d
Radu=r
a+d=90
a+r=79=>r=79-a
d+r=97
d+79-a=97=d-a=97-79=>d-a=18=>a=18+d
a+d=90=>18+d+d=90 => 2d=72=>d=36
a=18+36=54
r=79-54=25
Anca are 54 lei.
Diana are 36 lei.
Radu are 25 lei.
Diana=d
Radu=r
a+d=90
a+r=79=>r=79-a
d+r=97
d+79-a=97=d-a=97-79=>d-a=18=>a=18+d
a+d=90=>18+d+d=90 => 2d=72=>d=36
a=18+36=54
r=79-54=25
Anca are 54 lei.
Diana are 36 lei.
Radu are 25 lei.