SOLUTION: how many milliliters of a 20% acid solution should be mixed with 50 ml of an 8% acid solution to obtain an 18% acid solution

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Question 1051353: how many milliliters of a 20% acid solution should be mixed with 50 ml of an 8% acid solution to obtain an 18% acid solution
Answer by josgarithmetic(39617) About Me  (Show Source):
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How much of the 20% acid solution is v.
The amount of mixture is v+50.

%2820v%2B8%2A50%29%2F%28v%2B50%29=18