Question: A task runs alone on a CPU. The task starts and runs for 5 ms and then waits for 4 ms for the operating system

A task runs alone on a CPU. The task starts and runs for 5 ms and then waits for 4 ms for the operating system to run some instructions. The CPU is then idle for 2 ms while waiting for data from the disk. Finally the task runs another 5 ms and completes.
The CPU time is ___ ms.

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