Answers

2015-01-22T20:07:44+05:30


1 day's work of A=1/15

1 day's work of B=1/20

1 day's work of A+B= 1/15+1/20 = 7/60

4 day's work of A+B = 4*7/60 = 7/15

Hence remaining work = 1-7/15 = 8/15




0