document.write( "Question 1091693: A gardener has 25 kilos of a mixture of fertilizer and weed killer. If 1 kilo of the mixture is replaced by weed killer, the result is a mixture that is 10% weed killer. What percent of the original mixture was weed killer? \n" ); document.write( "

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A gardener has 25 kilos of a mixture of fertilizer and weed killer.
\n" ); document.write( " If 1 kilo of the mixture is replaced by weed killer, the result is a mixture that is 10% weed killer.
\n" ); document.write( " What percent of the original mixture was weed killer?
\n" ); document.write( ":
\n" ); document.write( "let x = the percent of weed killer in the original mixture (in decimal form)
\n" ); document.write( "x(25 - 1) + 1 = .10(25)
\n" ); document.write( "25x - x + 1 = 2.5
\n" ); document.write( "24x + 1 = 2.5
\n" ); document.write( "24x = 2.5 - 1
\n" ); document.write( "24x = 1.5
\n" ); document.write( "x = 1.5/24
\n" ); document.write( "x = .0625 = 6.25% is the original percent \n" ); document.write( "

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