A computer uses the first-fit system for memory management. …

A computer uses the first-fit system for memory management.      Initially, it has one block of 256{\kb} at address 0.  The requests come Arrival time Burst time Memory needed 3 10 170kb 6 4 80kb 6 4 90kb 13 1 140kb 20 14 70kb 24 10 10kb          How many blocks are left at times 3, 9, 18 and 25 and what are their size and address?