SOLUTION: How many grams of pure acid must be added to 40 grams of a 20% acid solution to make a solution that is 36% acid?

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Question 1068232: How many grams of pure acid must be added to 40 grams of a 20% acid solution to make a solution that is 36% acid?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
x=grams of pure acid.
pure acid formula .20(40)+1.00(x)=.36(40+x)
8+x=14.4+.36x
0.64x=6.4
x=10 gms.
10 is 1/5 of the final amount
36% is 1/5 of the way between 20% and 100%