The numbers on p.5 are wrong. A Purity Squad of four characters gets (4x2)+2=10 equipment rolls. A purity squad of 8 characters gets (8x2)+4= 20 equipment rolls. The numbers on p. 5 are from a previous version of the rules. Heck, I have a math disability and I don't see numbers when I re-read a document... sorry.
A band of 3 humans and two humanoids would get (2x3)+ (1x2)= 8 equipment rolls.