<PRE><B>Question 889568</B>
A chef is using a mixture of two brands of Italian dressing.
 The first brand contains 5% vinegar, and the second brand contains 12% vinegar.
 The chef wants to make 350 milliliters of a dressing that is 8% vinegar.
 How much of each brand should she use?
:
let v = the amt of 12% vinegar
then
(350-v) = amt of 5% 
:
A typical mixture equation using decimal equiv of %
.12v + .05(350-v) = .08(350)
.12v + 17.5 - .05v = 28
.12v - .05v = 28 - 17.5
.07v = 10.5
v = 10.5/.07
v = 150 ml of the 12% vinegar
then
350 = 150 = 200 ml of the 5%</PRE>