Răspuns :
Răspuns:
a+b+c=45
b=2a
c=15+b=15+2a
a + 2a + 15 + 2a = 45
5a = 45 - 15
5a = 30
a = 6 lei
b = 12 lei
c = 27 lei
x+y+z=45
y=2x
z=2x+15
x+2x+2x+15=45
5x+15=45
5x=30
x=6
y=12
z=27
Verificare: 6+12+27=45
y=2x
z=2x+15
x+2x+2x+15=45
5x+15=45
5x=30
x=6
y=12
z=27
Verificare: 6+12+27=45