Question 351192
Doreen Schmidt is a chemist. she needs to prepare 32 ounces of a 10% hydrochloric acid solution. find the amount of 16% solution and the mount of 8% solution she should mix to get this solution. 
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Let x = amount of 16% solution
then
32-x = amount of 8% solution
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Equation:

.16x + .08(32-x) = .10(32)


16x + 8(32-x) = 10(32)


16x + 256-8x = 320

8x + 256 = 320
8x = 64
x = 8 ounces (16% solution)
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8% solution:
32-x = 32-8 = 24 ounces