Răspuns :
p + c = 5.2
p = 3c
--------------------------- Inlocuim
3c + c = 5.2
4c = 5.2
c = 1.3 chifla
p = 3.9 painea
P +C = 5,20
P = 3C
3C +C = 5, 20
4C = 5,20
C = 5,20 : 4 = 1,30 lei
P = 3 × 1,30 = 3,90 lei
P = 3C
3C +C = 5, 20
4C = 5,20
C = 5,20 : 4 = 1,30 lei
P = 3 × 1,30 = 3,90 lei