Fillet a surface

hi all

I got a question in the exam that required a  surface gap to be filled and a fillet put in its place but as I don't use surfacing that much I didn;t have a glue what the best method to do it was so I left it. please could someone throw some light on this so I know for future. thanks

kev

I have attached the model file and its the large are to be repaired and they state a fillet of 9.525mm

SolidworksSurfacing