document.write( "Question 924050: an ore contains 20% zinc. how many kg of ore will be required to get 45 kg of zinc \n" ); document.write( "
Algebra.Com's Answer #560557 by Theo(13342)\"\" \"About 
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ore contains 20% zinc.
\n" ); document.write( "need 45 kg of zinc.\r
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\n" ); document.write( "\n" ); document.write( "x = amount of ore\r
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\n" ); document.write( "\n" ); document.write( "equation is .2 * x = 45
\n" ); document.write( "divide both sides of this equation by .2 to get:
\n" ); document.write( "x = 45 / .2
\n" ); document.write( "solve for x to get x = 225\r
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\n" ); document.write( "\n" ); document.write( "he needs 225 kg of ore to get 45 kg of zinc.
\n" ); document.write( ".2 * 225 = 45\r
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