1). 4m+3p=65
m=p:3
3m=p / x3
9m=3p si inlocuim in prima egalitate
4m+9m=65 ; 13 m=65 ; m= 5
p = 3m , deci p = 15
2). 3c+2p=60
p=c+5
3c + 2(c+5) = 60
3c+ 2c+10 = 60
5c=60-10
5c=50 ; c=10
p=c+5 deci p=15
3). matase notam cu m, stofa notam cu s
5m+2s= 220
m=s:3 /x3
3m=s / x2
6m=2s si inlocuim in prima egalitate
5m+6m= 220
11m=220
m=20
s=2m, deci s=60