document.write( "Question 847213: 4 litres of a 4% solution must be mixed with a 10% solution to get a 6% solution . How many litres of the 10% solution are needed? \n" ); document.write( "
Algebra.Com's Answer #510276 by swincher4391(1107)\"\" \"About 
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Let x be the litres needed for 10% solution. We know that we already use 4 litres of 4%. This means that 4+x will be used for our 6% solution. \r
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\n" ); document.write( "\n" ); document.write( "x(.10) + 4*.04 = 4+x * (.06)\r
\n" ); document.write( "\n" ); document.write( ".1x + .16 = .24 + .06x\r
\n" ); document.write( "\n" ); document.write( ".04x = .08\r
\n" ); document.write( "\n" ); document.write( "x = 2 litres.\r
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