Răspuns :
Anca=a
Diana=d
Radu=r
A+d=90
A+r=79
D+r=97
Le adunam si impartind la 2 obtinem
A+d+r=133
Si scazand din asta pe rand cele 3 relatii
Obttii r=43
D=54
A=36
A + D = 90
A + R = 79
D + R = 97
A = 90 - D
R = 97 - D
(90 - D) + (97 - D) = 79
187 - 2D = 79
108 = 2D
D = 54
A = 90 - 54 = 36
R = 97 - 54 = 43
Diana are 54, Anca are 36, Radu are 43 lei :)
A + R = 79
D + R = 97
A = 90 - D
R = 97 - D
(90 - D) + (97 - D) = 79
187 - 2D = 79
108 = 2D
D = 54
A = 90 - 54 = 36
R = 97 - 54 = 43
Diana are 54, Anca are 36, Radu are 43 lei :)