pharmacy calculations

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you need to prepare 180g of a 5% cream using 30% stock cream and a cream base.how much needed of each?

  • pharmacy calculations -

    You want to dilute the 30% cream by 30/5 = 6 times so you want 1 part of the 30% cream + 5 parts of the base. How much is 1 part? That's 180/6 = 30 g = 1 part.
    5 parts base = 5*30 = 150 g = 5 parts
    Total = 6 parts = 180g.

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