Question

anca si diana au impreuna 90 lei ,anca si radu au impreuna 79lei ,iar diana si radu au impreuna 97 lei.cati lei are fiecare copil

Answer 1

A+D=90=>A=90-D
A+R=79=>90-D+R=79
D+R=97
-D+R=79-90
D-R=90-79
D-R=11=>D=11+R
D+R=97=>11+R+R=97
2R=86
R=43
D=97-43=54
A=90-54
A=36