Sciencemadness Discussion Board

Simple concentration calculation

jeantoma - 6-4-2011 at 04:56

A was added to B from 15 to 80 wt %.

How do I do that in real? for 15 wt %
It sounds stupid, but I wanna be sure.

Is it like 100gr of A + 15 gr of B?
Or 15 gr of B + 85 gr of A??