P(ABC) = x+y+z = 36.
По подобию: x/12 = y/18 = z/24 = t,
x = 12t,
y = 18t,
z = 24t,
P(ABC) = x+y+z = 12t + 18t + 24t = 30t + 24t = 54t = 36,
отсюда t = 36/54 = (9*4)/(9*6) = 4/6 = 2/3.
Тогда,
x = 12*(2/3) = 4*2 = 8,
y = 18*(2/3) = 6*2 = 12,
z = 24*(2/3) = 8*2 = 16.