Question

In what proportions may 25%, 20%, and 10% ointments be mixed in order to prepare 15%...

In what proportions may 25%, 20%, and 10% ointments be mixed in order to prepare 15% ointment?

A. 1:1:1

B. 2:2:3

C. 1:1:3

D. 5:5:10

E. 3:3:1

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Answer #1

In order to prepare 15% ointment from 25%, 20%, and 10% ointments they must be mixted 1:1:3 proportions.

[(25)*1+(20)*1+(10)*3]/5 = 15%

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