C=cartofi. C+8=18.
C=18-8
C=10
c=ceapa.
C+c=18
C+3c=34
le scazi....
3c+C-c+C=34-18
2c=16
c=16:2
c=8
2)p=prăjituri
s=sucuri
4p+4s=16
4(p+s)=16
p+s=16:4
p+s=4
3)c=caietele
p=penarele
2c+3p=31
7c+3p=41
le scazi.
5c=41-31
5c=10
c=10:5
c=2
4+3p=31
3p=31-4
3p=27
p=27:3
p=9