Question

question 16

a pharmacy technician receives a prescription for 100 g of a 5% cream. the technician has 3% and 6% cream in stock. how many g of 3% and 6% cream should the technician use to prepare 100 g of the 5% cream?

• 45 g of 3% cream and 55 g of 6% cream
• 50 g of 3% cream and 50 g of 6% cream
• 20.5 g of 3% cream and 79.5 g of 6% cream
• 33.3 g of 3% cream and 66.7 g of 6% cream

Explanation:

Set up the alligation grid

Using the Alligation Method and Pharmacy Calculations knowledge points

$$
LATEXBLOCK0
$$

$$
LATEXBLOCK1
$$

Calculate total parts

Using the Pharmacy Calculations knowledge point

$$ \text{Total parts} = 2 \text{ parts (of 6\%)} + 1 \text{ part (of 3\%)} = 3 \text{ parts} $$

Determine the mass of each cream

Using the Pharmacy Calculations knowledge point

$$
LATEXBLOCK2
$$

Answer:

• 45 g of 3% cream and 55 g of 6% cream
• 50 g of 3% cream and 50 g of 6% cream
• 20.5 g of 3% ream and 79.5 g of 6% cream
• 33.3 g of 3% cream and 66.7 g of 6% cream (Correct answer)