You may have seen Pearson’s Square (or Pearson Square)
mentioned in books on winemaking, but few sources actually
say what it’s for. This article shows examples and explains
how to use it.
Pearson’s Square handily solves the problem of how to mix
two solutions of known percentages without having to solve
sets of simultaneous equations. If you love algebra, you just
keep on solving those simultaneous equations. Pearson’s
Square is for the rest of us and it’s just as accurate. You can
do it on the back of an envelope.