math
posted by Vicki .
If an albuterol inhaler contains 20mg of albuterol, how many inhalation doses can be delivered if each dose contains 90mcg?

math 
John
20 mg = 20 x 10^3 g
90 mcg = 90 x 10^6 g
no. of doses = 20 x 10^3 / 90 x 10^6 = 222
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