SOLUTION: If three different concentration are used (3,15,30W/W) how may they be mixed in order to prepare a 10% ointment ?! not solved by the graphically way !!!

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Question 1066882: If three different concentration are used (3,15,30W/W) how may they be mixed in order to prepare a 10% ointment ?! not solved by the graphically way !!!
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Some information is missing.

Imagine you want 100 of whatever weight quantity of the ointment.
x, y, z, the weights of the 3, 15, and 30, of whatever concentration, probably meant as percents.

x%2By%2Bz=100-----assuming 100 of your weight units of the mixture

%283x%2B15y%2B30z%29%2F100=10-----to account for the resulting 10% concentration mixture

You still need one more described relationship.