If it is A-C, then x+z=20 15x+25z=450 gives X = 5 and Z = 15.

In case of ethylene propylene, y+z = 20, 20y+25z = 450, y= 10, and z= 10.

If a, b, cx+y+z = 2015x+20y+25z = 45010x+5y = 50x =1y = 8z =1,x.