Question

Corina si Diana au sadit impreuna 67 de panselute . Corina a sadit 13 panselute mai multe fata de Diana. Cate panselute au sadit fiecare fata ?

Answer 1

C+D=67
C=D+13
D+13+D=67
2XD=54
D=27 panselute
C=27+13
C=40 panselute

Answer 2

Fie c-panselutele sadite de Corina si d-cele sadite de Diana
si atunci :
{c+d=67
c=d+13
si inlocuiesti in prima relatie

{d+13+d=67
c=d+13

d=27
c=27+13=40 panselute

Deci Diana 27 si Corina 40 de panselute.