No: one part of substance A plus three parts of substance B adds up to four parts. Your example ratio of 1:3 means its proportions are 1/4 A and 3/4 B.
Andrew
No: one part of substance A plus three parts of substance B adds up to four parts. Your example ratio of 1:3 means its proportions are 1/4 A and 3/4 B.
Andrew
Correct.
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