Question 673310
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Hi,
A does 4/5 of a work in 20 days. {{{4/5 = 20/25 }}} 1/25 per day 
 In 3 days then 3/25 of work:   1/5 - 3/25 = 2/25 left for B to do in 3 days
  {{{3*(2/75) = 2/25}}}
 B can do 2/75 of the total work in one day. {{{37.5(2/75) = 1}}}
  37 1/2 days to do the whole work