4 ms·fwiw, I was taught in the mid 90's about how (a/b) / (c/d) = (a/b) * (d/c) = (ad)/(bc)by lacksconfidence 11y agofwiw, I was taught in the mid 90's about how (a/b) / (c/d) = (a/b) * (d/c) = (ad)/(bc)