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A formula for ivy cream includes 3 g of hydrocortisone in a total of 60 g of ointment. If an order calls for 45 g of this ointment, how much hydrocortisone will be needed?

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jcherry99

Answer:

Explanation:

This is just a proportion.

3 grams hydrocortisone                 x    

======================    =  ==============

60 grams of ointment               45 grams of ointment

3/60 = x / 45               Cross multiply

45 * 3 = 60 * x             Combine the left.

135 = 60* x                  Divide by 60

135/60 = x

x = 2.25 grams of hydrocortisone.            

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