<PRE><B>Question 1070928</B>
let x be the number of ounces of the 25% solution
:
25% solution    x      0.25    0.25x
30% solution   18      0.30    5.40
mixture       x+18     0.26    0.26(x+18)
:
0.25x + 5.40 = 0.26 * (x + 18)
:
0.25x + 5.40 = 0.26x + 4.68
:
0.01x = 0.72
:
x = 72
:
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72 ounces of the 25% solution need to be mixed
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:
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