document.write( "Question 998508: Three kilograms of grass seed A contains 5% herbicide. A different type of grass seed, grass seed B which contains 20% herbicide, will be mixed with the 3 kilograms of grass seed A. How much grass seed B should be added to the 3 kilograms of grass seed A so that the resulting mixture contains 15% herbicide? \n" ); document.write( "

Algebra.Com's Answer #616298 by fractalier(6550) $\"\"$ $\"About$

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Let x be the amount of B needed. The setup looks like this:
\n" ); document.write( "3(.05) + x(.20) = (3+x)(.15)
\n" ); document.write( ".15 + .2x = .45 + .15x
\n" ); document.write( "Collect like terms and get
\n" ); document.write( ".05x = .3
\n" ); document.write( "x = 6 kg \n" ); document.write( "

\n" );