Ononot — A standard gold alloy is 18 \text{ karat}, meaning it is \fr

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A standard gold alloy is $18 \text{ karat}$ , meaning it is $\frac{18}{24}$ pure gold by mass. If you have $40 \text{ grams}$ of this alloy, what is the mass of the pure gold in $\text{milligrams}$ ?