Type 4 - Find the quantity of base or vehicle

9. Altering Product Strength 9.2) Alligation 9.2.1) Alligation Alligation Normal 1

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You want to prepare 12% of an ointment. You have some ointment base or vehicle and 400 g of 75% ointment. Calculate how many grams of base you need to mix with the 75% ointment in order to compound the product.

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lb equals 2100 g kg

    Tic-tac-toe, Short form:

    `[[75 % (400 \quad g),\quad\quad\quad\quad, 12 pt],[\quad\quad\quad\quad,12 % , \quad\quad\quad\quad],[0 % (? g),\quad\quad\quad\quad,63 pt]]`

    Therefore, 63 parts of the ointment base should be mixed with 12 parts of the ointment having a concentration of 75 % and the weight of 400 grams.
    `(400 \quad g)/(12 \quad parts)=x/(63 \quad parts) \quad therefore x = 2100 \quad g`. Ans.