Type 3 - Find the quantity of pure drug

9. Altering Product Strength 9.2) Alligation 9.2.1) Alligation

9.2.1.1) Alligation Normal 1


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How many grams of a pure drug powder should you add to 480 g of 20 % of an ointment of the same drug so that the blended strength becomes 31%?


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lb equals 76.52 g kg

    Tic-tac-toe, Short form:

    `[[100 % (? \quad g),\quad\quad\quad\quad, 11 pt],[\quad\quad\quad\quad,31 % , \quad\quad\quad\quad],[20 % (480 \quad g),\quad\quad\quad\quad,69 pt]]`

    Therefore, 11 parts of pure drug should be mixed with 69 parts of the mixture which has a concentration of 20 % and the weight of 480 grams.
    `(480 \quad g)/(69 \quad parts)=x/(11 \quad parts) \quad therefore x = 76.52 \quad g`. Ans.