1)X-? Y-? Z-?
123=x+y+z
x:y=2:5
y:z=3:4

2) X-? Y-? Z-?
145=x+y+z
x:y=4:3
y:z=2:5

x=2y/5z=4y/3123=2y/5+y+4y/3123=(6y+15y+20y)/15123*15=41yy=123*15/41y=45x=2*45/5x=18z=4*45/3z=60x=4y/3z=5y/2145=4y/3+y+5y/2145=(8y+6y+15y)/6145*6=29yy=145*6/29y=30x=4*30/3x=40z=5*30/2z=75