1) x/2 = y/3 = z/4 si x = 2y -120
deci
(2y-120)/2 = y/3, deci 6y-360 = 2y, deci 4y = 360. y = 90.
x/2 = 90/3 = 30, deci x = 2*30 = 60.
z/4 = 90/3 = 30, deci z = 30*4 = 120
2) x+y+z = 712 si x-24 = y+24 = z. adica x= y+48
(y+48)+y+z = 712. 2y+48+(y+24) = 712, deci 3y+72 = 712. adica 3y = 640