A pharmacist needs to fill an order for a 3% lidocaine topical cream. However, only 2% and 4% concentrations are in stock. How much of the 4% concentration should be mixed with 10 g of the 2% concentration to get a 3% concentration?
What will be an ideal response?
Let x = the amount of 4% concentration.
0.02(10) + 0.04x = 0.03(x + 10)
0.2 + 0.04x = 0.03x + 0.3
0.01x = 0.1
x = 10 g
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