SOLUTION: How many ml of 70% acid solution must be added to a 20% acid solution to obtain 100 ml of a 50% acid solution?

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Question 248715: How many ml of 70% acid solution must be added to a 20% acid solution to obtain 100 ml of a 50% acid solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
total mixture will be 100
we use x amount in the 70 % solution and 100-x in the 20% solution
70%=70/100
20%=20/100
50%=50/100
70x/100+20/100*(100-x)=50/100*(100)