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?

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) (Show Source): You can put this solution on YOUR website!
w = grams of the acid to add, strenth 100%.

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
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