document.write( "Question 849348: a father and his son are painting a wall. If they paint together it takes 4 days to complete, but if the father paint it alone, it will be 6 days faster than the son paint it alone. So, what is the time needed for the son to paint the wall alone? \n" ); document.write( "
Algebra.Com's Answer #511496 by richwmiller(17219)\"\" \"About 
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4/(s-6)+4/s=1\r
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