document.write( "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? \n" ); document.write( "
Algebra.Com's Answer #483799 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
w = grams of the acid to add, strenth 100%.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%2850%2A10%2Bw%2A100%29%2F%28w%2B50%29=20\"
\n" ); document.write( "Solve for w.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The suggestion occurred, to make a gridded table of data to help in setting up the equation:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "_________________10%______________100%______________20%
\n" ); document.write( "Mass Acid_______(0.10)50__________(1.00)w__________(50+w)*(0.20)
\n" ); document.write( "Mass Soln_______50________________w_________________50+w
\n" ); document.write( "
\n" );