Suppose a disk has 200 cylinders numbered from 0 to 199. At some time, disk arm is at cylinder 76 and there is a queue of disk access requests for cylinders:
54, 32, 108, 22, 67, 77, 87, 87, 42, 82
The distance that will be travelled by the R/W head when the SCAN (elevator) algorithm used is ________tracks. Assume that SCAN algorithm moves towards 199 when it starts execution.