Question 472732
Mar can do {{{1/5}}} of the job in a day
Louie can do {{{1/3}}} in a day
Together they can do {{{1/5 + 1/3}}} in a day
{{{1/5 + 1/3 }}} = {{{3/15 + 5/15}}} = {{{8/15}}} per day
{{{(8/15) * y = 1}}}
{{{y = 15/8}}} 
so it will take 1 and 7/8 day