document.write( "Question 1146303: 3 boys are working on a school project. Joseph and Bill can finish the prohectbin 10 days. Bill and Elmer can finish it in 12 days. Joseph and Elmer can finish it in 15 days. If each boy works alone, how long will it take him to finish the project? \n" ); document.write( "
Algebra.Com's Answer #767582 by josgarithmetic(39618)\"\" \"About 
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Each boy's RATE:
\n" ); document.write( "x, y, z for Joseph, Bill, Elmer\r
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\n" ); document.write( "\n" ); document.write( "\"system%28x%2By=1%2F10%2Cy%2Bz=1%2F12%2Cx%2Bz=1%2F15%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"x%2By%2By%2Bz%2Bx%2Bz=1%2F10%2B1%2F12%2B1%2F15\"\r
\n" ); document.write( "\n" ); document.write( "\"2x%2B2y%2B2z=6%2F60%2B5%2F60%2B4%2F60\"\r
\n" ); document.write( "\n" ); document.write( "\"2x%2B2y%2B2z=15%2F60\"\r
\n" ); document.write( "\n" ); document.write( "\"2%28x%2By%2Bz%29=1%2F4\"\r
\n" ); document.write( "\n" ); document.write( "\"x%2By%2Bz=1%2F8\"\r
\n" ); document.write( "\n" ); document.write( "-\r
\n" ); document.write( "\n" ); document.write( "\"x%2By%2Bz-%28y%2Bz%29=1%2F8-1%2F12\"---------this will give value for x, a rate for Joseph; from which you want its reciprocal.\r
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\n" ); document.write( "\n" ); document.write( "The other two are done similarly.
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