SOLUTION: How many milliliters of a 12% acid solution and how many milliliters of a 4% acid solution must be mixed to obtain 40ml of a10% acid solution?

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Question 520647: How many milliliters of a 12% acid solution and how many milliliters of a 4% acid solution must be mixed to obtain 40ml of a10% acid solution?
Answer by mananth(16946) About Me  (Show Source):
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---------percent ---------------- quantity
Acid type I 12 ---------------- x ml
Acid type II 4 ------ 40 - x ml
Mixture 10.00% ---------------- 40

12 x + 4 ( 40 - x ) = 10 * 40

12x+160 -4x=400
12 x-4x =400-160
8 x = 240
/ 8
x = 30 ml 12.00% Acid type I
10 ml 4.00% Acid type II