Compute the mass fractions of liquid in the following refractory materials at 1600°C (2910 F):
(a) 4 wt% Al203-96 wt% SiO2
(b) 21 wt% Al203-79 wt% SiO2
(c) 60 wt% Al203-40 wt% SiO2
(d) 80 wt% Al203-20 wt% SiO2