Huduko Incorporated offers a number of computer services. Huduko operates with a utilization of $35$ percent. The interarrival time of jobs is $5$ milliseconds $(0\mathrm{.}005$ second$)$ with a coefficient of variation of $1\mathrm{.}5.$ On average, there are $15$ jobs waiting in the queue to be served and $60$ jobs in process $($i$.$e$.,$ being processed by a server rather than waiting to be sent to a server for processing$).$

How many servers do they have in this system?