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
Total tried: Correct: Wrong:
How many grams of a pure drug powder should you add to 680 g of 25 % of an ointment of the same drug so that the blended strength becomes 76%?
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lb equals 1445 g kg
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Tic-tac-toe, Short form:
`[[100 % (? \quad g),\quad\quad\quad\quad, 51 pt],[\quad\quad\quad\quad,76 % , \quad\quad\quad\quad],[25 % (680 \quad g),\quad\quad\quad\quad,24 pt]]`
Therefore, 51 parts of pure drug should be mixed with 24 parts of the mixture which has a concentration of 25 % and the weight of 680 grams.
`(680 \quad g)/(24 \quad parts)=x/(51 \quad parts) \quad therefore x = 1445 \quad g`. Ans.