Pharmacy Tech Math - Alligation tutorial II |
Alligation Example #1 |
You have on hand a 70% alcoholic elixir and a 20% alcoholic elixir. The prescription calls for a 30% alcoholic elixir. In what proportion must the 70% elixir and the 20% elixir be combined to make a 30% elixir? A. 2 parts 70% / 1 part 20% |
After drawing the problem matrix, inserting the
quantities, and subtracting along the diagonals, we get 10 parts of the
70% elixir and 40 parts of the 20% elixir. (And, since both numbers have a common denominator, reduce them)
This means that if one part of 70% elixir is mixed with four parts of 20% elixir, it will yield five parts of 30% elixir. The dotted arrows in the matrix above are a reminder that the total number of parts always represents the desired strength.
Go to the next page - Alligation example #2
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