Dadan and Arief can do a piece of work in 10 days, arief and afif in 15 days, afif and dadan in 20 days. They all work at it for 6 days and then Dadan leaves. Arief and afif go on together for 4 days more. If arief then leaves, how long will afif take to complete the work?



afif take to complete the work10 years