On the Subject of Tungsten Refinment

[Gregorius (Gregorius Techneticies)]

2 H + 1 O = 3 H2O, so 2 + 1 = 3.

So 6 H + 4 WO3 = 1 W + 9 H2O. so 6 + 4 = 1 + 9 = 10

Simple Maths based on Unit amounts and not mass or Volume.