[" A can do a work in "15" days and "B" in "20" days.If they "],[" together work on it for "4" days,then the fraction of the "],[" work that is left is: "]

A can do a work in 15 days and B in 20 days. If they work together on it for 4 days, what fraction of the work will be left ?

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

A can do a work in 15 days and B in 20 days.If they work on it together for 4 days,then the fraction of the work that is left is (1)/(4) b.(1)/(10)c(7)/(1)d.(8)/(15)

A can do a work in 20 days and B can do it in 14 days. If they work together for 7 days, then the fraction of the work left is: