Răspuns :
Cati copaci de fiecare fel s-au plantat in parc?
320+408+360=1088
320+408+360=1088
c+t=320
t+m=408
c+m=360
c+t+t+m+c+m=320+408+360
2c+2t+2m=1088
2(c+t+m)=1088 |:2
c+t+m=544
m=544-(c+t)=544-320=224
c=544-(t+m)=544-408=136
t=544-(c+m)=544-360=184
R. 136 castani; 184 tei; 224 mesteceni
t+m=408
c+m=360
c+t+t+m+c+m=320+408+360
2c+2t+2m=1088
2(c+t+m)=1088 |:2
c+t+m=544
m=544-(c+t)=544-320=224
c=544-(t+m)=544-408=136
t=544-(c+m)=544-360=184
R. 136 castani; 184 tei; 224 mesteceni