Question

Ajutor ! dau coroana la primu care raspunde corect si 100 ❤

Answer 1

X lei un scaun,y lei o masa
12x+7y=320
4x=3y
16y=320. Y=20lei
X= 15 lei

Answer 2

12s+7m=320 lei
4s=3m.....=> 12s=12:4*3m....=> 12s=3*3m....=> 12s=9m

9m+7m=320 lei
16m=320
m=320:16
m=20 lei  (o masa)...=> 7m=20 lei*7...=>140 lei
4s=20 lei*3
4s=60 lei
s=60:4
s=15 lei (un scaun)....=> 12s=15 lei*12...=>12s=180lei

140+180=320 lei in total