SOLUTION: How many ounces of a 30 % solution must be mixed with 12 ounces of a 35 % solution to make a 33 % solution

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Question 399300: How many ounces of a 30 % solution must be mixed with 12 ounces of a 35 % solution to make a 33 % solution
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
a = ounces of 30% solution to use
%28.3a+%2B+.35%2A12%29%2F%28a+%2B+12%29+=+.33
.3a+%2B+4.2+=+.33%2A%28a+%2B+12%29
.3a+%2B+4.2+=+.33a+%2B+3.96
.03a+=+4.2+-+3.96
.03a+=+.24
a+=+8
8 ounces of the 30% solution are needed