Question

P is able to do a piece of work in 15 days and Qcan do the
sarne work in 20 days. If they can work together for 4 days,
what is the fraction of work left?​

Answer 1

Step-by-step explanation:

p→15d and q→20d if they work together then the work done by them in 1 day is =7/60 ::(1/15+1/20=4+3/60) then for 4 days=28/60=7/15 then fraction of work is left=8/15