Solve for x . Pls help!

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Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

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Acertain drug is made from only two ingredients: compound a and compound b. there are 3 millimeters of compound a used for every 4 millimeters of compound b. if a chemist wants to make 693 milliliters of the drug, how many milliliters of compound a are needed?