A + B + C = 588
A = |----P-----|
B = |----P-----|-----P-----|----P----|
C = |----P-----|-----P-----|----P----|--21--|
A+B+C = P + P + P + P + P + P + P + 21
588- 21 = 567
567 : 7 ( adica P-urile )
=81 ( adica un P )
A = 81
B = 81x3 = 243
C = 81x3+21
C = 243+12=256
R =
A=81; B= 243;C=256