document.write( "Question 163722: How many onces of 5% Hydrochloric acid, 20% hydro. acid, and water must be combined to get 10 oz of solution that is 8.5% hydro. acid if the amount of water used must equal the total amount of the other two solutions? \n" ); document.write( "
Algebra.Com's Answer #120718 by ankor@dixie-net.com(22740)\"\" \"About 
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How many ounces of 5% Hydro-chloric acid, 20% hydro acid, and water must be
\n" ); document.write( " combined to get 10 oz of solution that is 8.5% hydro acid if the amount of
\n" ); document.write( " water used must equal the total amount of the other two solutions?
\n" ); document.write( ":
\n" ); document.write( "That means that half the final solution has to be water: 5 oz
\n" ); document.write( "And half has to be a mixture of the two acids.
\n" ); document.write( "When the two are combined the percent will be halved
\n" ); document.write( "Calculate the amt required to make 5 oz of 17% solution
\n" ); document.write( ":
\n" ); document.write( "Let x = amt of 5% acid
\n" ); document.write( "then
\n" ); document.write( "(5-x) = amt of 20% acid
\n" ); document.write( ":
\n" ); document.write( "The equation:
\n" ); document.write( ".05x + .2(5-x) = .17(5)
\n" ); document.write( ".05x + 1 - .2x = .85
\n" ); document.write( ".05x - .20x = .85 - 1
\n" ); document.write( "-.15x = -.15
\n" ); document.write( ":
\n" ); document.write( "x = 1 oz of 5% solution
\n" ); document.write( "then
\n" ); document.write( "4 - 1 = 4 oz of 20% solution
\n" ); document.write( ":
\n" ); document.write( "When the 5 oz mixture is mixed with 5 oz of water:
\n" ); document.write( ".17(5) = .085(5 + 5)
\n" ); document.write( ".85 = .085(10)
\n" ); document.write( ".85 = .85
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