Compute the mass fractions of liquid in the following refractory

Compute the mass fractions of liquid in the following refractory materials at 1600째C (2910째F):
(a) 6 wt% Al2O3-94 wt% SiO2
(b) 10 wt% Al2O3-90 wt% SiO2
(c) 30 wt% Al2O3-70 wt% SiO2
(d) 80 wt% Al2O3-20 wt% SiO2