document.write( "Question 905102: If A does a job in 16 hours and B does the same job in 12 hours, if B and C do the job together in 4 hours how long would it take C to do the job himeself \n" ); document.write( "

Algebra.Com's Answer #549046 by richwmiller(17219) $\"\"$ $\"About$

You can put this solution on YOUR website!
1/b+1/c=1/4
\n" ); document.write( "1/12+1/c=1/4
\n" ); document.write( "rate for A alone 12
\n" ); document.write( "rate for A & c together 4
\n" ); document.write( "1/a+1/c=1/x
\n" ); document.write( "1/12+1/c=1/4
\n" ); document.write( "1/c=1/4-1/12
\n" ); document.write( "1/c=12/48-4/48
\n" ); document.write( "1/c=8/48
\n" ); document.write( "1/c=1/6
\n" ); document.write( "c=6
\n" ); document.write( "rate for c alone 6
\n" ); document.write( "check
\n" ); document.write( "1/12+1/6=1/4
\n" ); document.write( "6/72+12/72=1/4
\n" ); document.write( "18/72=1/4
\n" ); document.write( "ok\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Note we have extra info. We don't need the info about A unless you left something out \n" ); document.write( "

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