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
Homework Answers
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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