Question: Explain how the Linux kernel variables HZ and jiffies can be used to determine the number of seconds the system has been running since it

Explain how the Linux kernel variables HZ and jiffies can be used to
determine the number of seconds the system has been running since it was
booted.
You can use an example e.g. Given 5HZ and 20 jiffies, here is how I can
determine how many seconds have elapsed since my system started running.
Then explain your reasoning behind your process and show your calculation

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