<PRE><B>Question 637708</B>
9 quarts of a sugar solution was mixed 6 quarts of a 90% sugar solution
 to make an 84% sugar solution.
 What is the percent concentration of the first solution?
:
Let x = the decimal equiv of the required percentage of the 1st solution
The total amt: 9 + 6 = 15 qts
:
9x + .90(6) = .84(15)
9x + 5.4 = 12.6
9x = 12.6-5.4
9x = 7.2
x = 7.2/9
x = .8 which is an 80% solution
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