SOLUTION: How many grmas of 80% hydrochloric acid solution must be added to 40 grams of 15% hydrochloric acid solution to procuduce a 40% acid solution

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Question 458234: How many grmas of 80% hydrochloric acid solution must be added to 40 grams of 15% hydrochloric acid solution to procuduce a 40% acid solution
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.8m+40(.15)=.4(m+40)
.8m+6=.4m+16
.4m=10
m=10/.4=25
You need 25 gms. of 80% solution for your mix
.8(25)+.15(40)=20+6=.4(65)=26..