document.write( "Question 1163735: There is a project. Company A alone needs 20 days to finish. If A works with B, then it takes 12 days. If A works for 16 days alone, B will finish the rest. How many days are needed for B to finish it? \n" ); document.write( "
Algebra.Com's Answer #787921 by ankor@dixie-net.com(22740)\"\" \"About 
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There is a project. Company A alone needs 20 days to finish.
\n" ); document.write( " If A works with B, then it takes 12 days.
\n" ); document.write( "b = time for B to do the job alone
\n" ); document.write( "let the completed job = 1
\n" ); document.write( "\"12%2F20\" + \"12%2Fb\" = 1
\n" ); document.write( "multiply 20b
\n" ); document.write( "12b + 20(12) = 20b
\n" ); document.write( "12b + 240 = 20b
\n" ); document.write( "240 = 20b - 12b
\n" ); document.write( "240 = 8b
\n" ); document.write( "b = 240/8
\n" ); document.write( "b = 30 days, B by itself
\n" ); document.write( ":
\n" ); document.write( " If A works for 16 days alone, B will finish the rest.
\n" ); document.write( " How many days are needed for B to finish it?
\n" ); document.write( "let d = time for B to finish the job
\n" ); document.write( "\"16%2F20%29\" + \"d%2F30\" = 1
\n" ); document.write( "multiply equation by 60
\n" ); document.write( "3(16) + 2d = 60
\n" ); document.write( "2d = 60 - 48
\n" ); document.write( "2d = 12
\n" ); document.write( "d = 12/2
\n" ); document.write( "d = 6 days for B to finish the job \n" ); document.write( "
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