### Determine drug quantity from ratio strength and volume

3. Percent, Ratio, mg/mL, PPM, PPB 3.2) Ratio 3.2.1) Ratio - General

3.2.1.1) Ratio - General Normal 1

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The strength of a medication is expressed as 1 : 690. Determine the quantity of drug in 540 mL of this product.

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lb equals 0.783 g kg

1 : 690 means, 1 g of drug is present in each 690 mL of the solution.

To determine the gram amount of drug present in 540 mL of the solution we can write:
(1 \quad g)/(690 \quad mL)=x/(540 \quad mL) therefore x = 0.783  g.

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