SOLUTION: How much pure acid must be added to 12 ounces of a 40 percent acid solution in order to produce a 60 percent acid solution?

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Question 771615: How much pure acid must be added to 12 ounces of a 40 percent acid solution in order to produce a 60 percent acid solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
H = 100%
y = unknown ounces of H
L = 40%
X = 12 ounces of L
T= 60%, concentration wanted

ONLY one unknown. Need only one equation.

BASIC EQUATION, %28LX%2BHy%29%2F%28X%2By%29=T SOLVE FOR y.
LX%2BHy=T%28X%2By%29
LX%2BHy=TX%2BTy
Hy-Ty=TX-LX
y%28H-T%29=TX-LX
highlight%28y=X%28T-L%29%2F%28H-T%29%29

Substitute available values to find the value for y.