document.write( "Question 1204766: You currently have 325 lb of a cement mixture containing 18.0% sand by mass.
\n" ); document.write( "How much sand must you add to create a mixture that is 25.0% sand by mass? \n" ); document.write( "
Algebra.Com's Answer #841242 by mananth(16946)\"\" \"About 
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You currently have 325 lb of a cement mixture containing 18.0% sand by mass.
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\n" ); document.write( "\n" ); document.write( "You currently have 325 lb of a cement mixture containing 18.0% sand =58.5 lbs sand
\n" ); document.write( "Assume we add x lbs of sand\r
\n" ); document.write( "\n" ); document.write( "58.5+x = (325+x)*0.25\r
\n" ); document.write( "\n" ); document.write( "58.5+x = 81.25 +0,25x\r
\n" ); document.write( "\n" ); document.write( "x-0.25x = 81.25-58.5=22.75\r
\n" ); document.write( "\n" ); document.write( "0.75x=22.75\r
\n" ); document.write( "\n" ); document.write( "x= 22.75/0.75= 30.33 approx\r
\n" ); document.write( "\n" ); document.write( "Check\r
\n" ); document.write( "\n" ); document.write( "Total Sand / Total mix \r
\n" ); document.write( "\n" ); document.write( "(58.5+30.33)/(325+30.33) =0.2499 = 24.99 %\r
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