Doubt from Analysis of Pyrex glass

solved
moderate
pyrex-glass
mole-analysis
find-ratio
pp
#1

An analysis of Pyrex glass showed 12.9% B2O3, 2.2% Al2O3, 3.8% Na2O3, 0.4% K2O and 80.7% SiO2. What is the ratio of Si to B in the glass?

#2