Acertain drug is made from only two ingredients: compound a and compound b. there are 3 milliliters of compound a used for every 4 milliliters of compound b. if a chemist wants to make 553 milliliters of the drug, how many milliliters of compound a are needed?

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6

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