The phrase "30 of 3" typically indicates a specific calculation, where "30" represents a certainquantity or ratio, and "of 3" suggests that this quantity is being divided into portions or components of "3". The resulting figure represents the portion or fraction of the original quantity that equals "30". For example, if a recipe calls for 30 ingredients and you are preparing a double batch, you would calculate how many of those ingredients you need by dividing 30 by 2. The answer, 15, would represent 30 of 3 in this context, indicating that you should prepare 15 ingredients for a double batch.