Question 802208
w = grams of the acid to add, strenth 100%.


{{{(50*10+w*100)/(w+50)=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