document.write( "Question 877485: The total number of workers in a factory is 120, and they earn an average wage of $80 per month.Some of them earn a wage of $60 and all of the rest earn a wage of $90.Find the number of workers who earn a wage of $60?
\n" ); document.write( "A) 32
\n" ); document.write( "B) 40
\n" ); document.write( "C) 50
\n" ); document.write( "D) 60 \n" ); document.write( "
Algebra.Com's Answer #529403 by ankor@dixie-net.com(22740)\"\" \"About 
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The total number of workers in a factory is 120, and they earn an average wage of $80 per month.
\n" ); document.write( "Some of them earn a wage of $60 and all of the rest earn a wage of $90.Find the number of workers who earn a wage of $60?
\n" ); document.write( ":
\n" ); document.write( "Let x = no. of workers that earn $60
\n" ); document.write( "then
\n" ); document.write( "(120-x) = no. of workers that earn $90
\n" ); document.write( ":
\n" ); document.write( "\"%2890%28120-x%29+%2B+60x%29%2F120+=+80\"
\n" ); document.write( "multiply both sides by 80
\n" ); document.write( "90(120-x) + 60x = 80(120)
\n" ); document.write( "10800 - 90x + 60x = 9600
\n" ); document.write( "-90x + 60x = 9600 - 10800
\n" ); document.write( "-30x = -1200
\n" ); document.write( "x = -1200/-30
\n" ); document.write( "x = +40 workers earn $60
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check this
\n" ); document.write( "80*90 = 7200
\n" ); document.write( "40*60 = 2400
\n" ); document.write( "--------------
\n" ); document.write( "total: 9600
\n" ); document.write( "av = 9600/120 = 80 \n" ); document.write( "
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