SOLUTION: find how many mililitres of 3% acid solution and 7% acid solution should be mixed to yield 120 ml of 5% acid solution

SOLUTION: find how many mililitres of 3% acid solution and 7% acid solution should be mixed to yield 120 ml of 5% acid solution

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Question 913026: find how many mililitres of 3% acid solution and 7% acid solution should be mixed to yield 120 ml of 5% acid solution
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Intuitively, if we mix equal amounts of the 3% and 7% solution, we should obtain a 5% solution (e.g. if we have 100 mL of the 3% and 100 mL of the 7%, we will have 200 mL, of which 10 mL is acid, 5%).

Hence we must have 60 mL of 3% solution and 60 mL of 7% solution.
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