document.write( "Question 411202: How much of a 5% solution must be added to 400ml of a 10% salt solution to obtain a 7% solution? \n" ); document.write( "
Algebra.Com's Answer #289056 by robertb(5830)\"\" \"About 
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0.05x + 0.10*400 = 0.07(x + 400)\r
\n" ); document.write( "\n" ); document.write( "0.05x + 40 = 0.07x + 28\r
\n" ); document.write( "\n" ); document.write( "12 = 0.02x\r
\n" ); document.write( "\n" ); document.write( "x = 600 ml of the 5% solution.
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