Answers

2015-07-31T21:28:39+05:30
Total work --------  12 days 
1 day ------------------- 1/12th part of work can be done
A works 20 days to finish total work
then for 
1day------------------- 1/20th part of work can be done by A alone
1/12=1/20+x
find the value of x
you would get the work done by B in one day
(answer =1/30
B works alone for 30 days)
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