document.write( "Question 636323: I have on hand 98% alcohol. How much sterile water do I need to add to arrive at a solution of 20%. \n" ); document.write( "
Algebra.Com's Answer #400922 by ptaylor(2198)\"\" \"About 
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Please re-check your problem.
\n" ); document.write( "Seems like we need to know the amount of 98% alcohol that you have on hand.\r
\n" ); document.write( "\n" ); document.write( "Hope this helps---ptaylor
\n" ); document.write( "The 98% alcohol is in a 5 ml vial, soooo
\n" ); document.write( "Let x=amount of sterile water needed
\n" ); document.write( "Now we know that the amount of pure alcohol before the mixture takes place(0.98)*5 has to equal the amount of pure alcohol after the mixture takes place 0.20(5+x).\r
\n" ); document.write( "\n" ); document.write( "Sooo our equation to solve is:
\n" ); document.write( "0.98*5=0.20(5+x) simplify
\n" ); document.write( "4.9=1+0.20x subtract 1 from each side
\n" ); document.write( "3.9=0.20x
\n" ); document.write( "x=19.5 ml---amount of sterile water needed
\n" ); document.write( "CK
\n" ); document.write( "0.98*5=0.20(5+19.5)
\n" ); document.write( "4.9=1+3.9
\n" ); document.write( "4.9=4.9\r
\n" ); document.write( "\n" ); document.write( "Hope this helps---ptaylor
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