document.write( "Question 1095245: A homeowner estimates that it will take 9 days to roof his house. A professional roofer estimates that he could roof the house in 5 days. How long will it take if the homeowner helps the roofer? \n" ); document.write( "
Algebra.Com's Answer #709809 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
Only if the combined rates are truly additive,...\r
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\n" ); document.write( "\n" ); document.write( "\"1%2Fx=1%2F9%2B1%2F5\", rate unit being JOBs per DAY\r
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\n" ); document.write( "\n" ); document.write( "\"9%2A5%2Ax%281%2Fx%29=9%2A5%2Ax%281%2F9%2B1%2F5%29\"\r
\n" ); document.write( "\n" ); document.write( "\"45=5x%2B9x\"\r
\n" ); document.write( "\n" ); document.write( "\"14x=45\"\r
\n" ); document.write( "\n" ); document.write( "\"x=45%2F14\"\r
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\n" ); document.write( "\n" ); document.write( "\"x=3%263%2F14\"; just a little more than 3 days.
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