document.write( "Question 906942: One clerk can file 12 folders per minute and a second clerk, 9. How long will it take them working together to file 672 folders? \n" ); document.write( "
Algebra.Com's Answer #550114 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
Northern's method can be formulated.
\n" ); document.write( "(12x20) + (9x20) = 420
\n" ); document.write( "(12x40) + (9x40) = 840
\n" ); document.write( "(12x30) + (9x30) = 630
\n" ); document.write( "(12x32) + (9x32) = 672
\n" ); document.write( "So it will take 32 minutes\r
\n" ); document.write( "\n" ); document.write( "(12*t)+(9*t)=f
\n" ); document.write( "factor
\n" ); document.write( "t*(9+12)=f
\n" ); document.write( "add
\n" ); document.write( "t*21=f where f=672
\n" ); document.write( "substitute
\n" ); document.write( "t*21=672
\n" ); document.write( "solve
\n" ); document.write( "t=672/21
\n" ); document.write( "t=32
\n" ); document.write( "which is essentially what tutor josmiceli said in a more complicated way.\r
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