SOLUTION: Phil has a 10% acid solution, but he wants to increase the strength to 20%. If he has 50 g of the solution, how much acid must he add?

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Question 802208: Phil has a 10% acid solution, but he wants to increase the strength to 20%. If he has 50 g of the solution, how much acid must he add?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
w = grams of the acid to add, strenth 100%.

%2850%2A10%2Bw%2A100%29%2F%28w%2B50%29=20
Solve for w.


The suggestion occurred, to make a gridded table of data to help in setting up the equation:

_________________10%______________100%______________20%
Mass Acid_______(0.10)50__________(1.00)w__________(50+w)*(0.20)
Mass Soln_______50________________w_________________50+w